Need Information please

[tebroc]

I have just build a vivarium out of a wall unit and used plexiglass instead of glass. As UV rays do not pass through it, do I need to put a UV bulb in.
I have a seven foot Rough Scaled Python.
Thanks
:confused:

[Scubadiver59]

This is a highly debated subject in some threads...whether or not snakes need UVA/UVB/etc. I'm too new to the herp hobby, but others will chime in according to their views, etc.

I'm gonna go out on a limb and say it's not exactly necessary, snakes don't need UV as much as other reptiles, but it won't hurt the snake if you decide to add it.

[dannybgoode]

I'm a big advocate of uv for all reptiles. Will a snake die without it. No

Do they benefit from it? Yes and therefore I give the option. When i get time I'll put together something more concrete than this.

All my vivs have it and it's factored into the cost of any new setup I am considering.

[FWK]

Lizards, Turtles, and insect eating snakes (such as the popular Rough Green Snake) need UVB in order to synthesize vitamin D3, which is needed to metabolize dietary calcium. Rodent eating snakes do not need UVB.

Welcome to the forum. Be sure to post pictures of your snake and your custom enclosure when you can.

[dannybgoode]

Lizards, Turtles, and insect eating snakes (such as the popular Rough Green Snake) need UVB in order to synthesize vitamin D3, which is needed to metabolize dietary calcium. Rodent eating snakes do not need UVB.

They don't *need* it as in won't die without but they do hugely benefit from it.

Depends on your definition of need in this respect. In my book they hugely benefit from it therefore it is a requirement.

There's lots of things we provide for other animals that they don't *need* but is still considered best practice.

[eminart]

They don't *need* it as in won't die without but they do hugely benefit from it.



Are there any actual scientific studies on this? I'm not disputing what you say, but if there isn't, I'd think UVB could just as likely be harmful to nocturnal animals as helpful. If they don't need it, how is it helpful? Again, I don't know. I'm asking if anyone does know these things as proven fact.

[FWK]

They don't *need* it as in won't die without but they do hugely benefit from it.

Depends on your definition of need in this respect. In my book they hugely benefit from it therefore it is a requirement.

Could you provide data indicating the huge benefits you suggest? Peer-reviewed publications and papers are preferred. "In my book" relays your opinion, which you are entitled to, but I do not base my husbandry techniques on opinion.

[dannybgoode]

Could you provide data indicating the huge benefits you suggest? Peer-reviewed publications and papers are preferred. "In my book" relays your opinion, which you are entitled to, but I do not base my husbandry techniques on opinion.

Yes there's lots of papers. There's been a significant amount of research this field over the last couple of years and I'll put something together. I may even have chance tonight as my wife is working so I've got a bit of time.

Anecdotally, providing uv for 10 plus snakes is bloody expensive and I would not spend the money on a whim. Further i know keepers with 100+ vivs all fitted with uv. This is not a cheap undertaking or a vanity project for them either.

@eminart - Again anecdotally I've observed all my snakes most of which are nocturnal species actively basking under the uv when they have plenty of options to hide. Everyone I know who has tried uv, even if only to prove the theory wrong, has observed their snakes bask under it.

Further as it happens Francis Baines, possibly the world's foremost authority on reptiles and their use of the light spectrum (from infrared through to ultraviolet) is putting together a paper specifically on nocturnal snakes and their use of uv.

[dannybgoode]

Are there any actual scientific studies on this? I'm not disputing what you say, but if there isn't, I'd think UVB could just as likely be harmful to nocturnal animals as helpful. If they don't need it, how is it helpful? Again, I don't know. I'm asking if anyone does know these things as proven fact.

Also bear in mind nocturnal means active at night. This doesn't mean a nocturnal animal necessarily hides during the day just that it's generally resting. It may well rest in the open (this most species of cat for example) and the same can apply to nocturnal snakes.

[dannybgoode]

I've just been in my reptile room to change water bowls etc and noticed all 5 snakes were out basking under their uv. Even my C hortulanus is as close to the uv source as he can get. Note from the photos of the vivs I assume this is a preferential choice by the snakes as they all have plenty of options to be under cover - either partially or completely.

Again I appreciate this is anecdotal however these observations match those of pretty much everyone who has tried uv. I know TRD tried it and was surprised by how quickly his mbk went to bask under it.

I will post papers etc in due course but found it interesting that all my snakes were fully out and basking under it...

http://www.dannybower.co.uk/photos/Bask1.jpg
http://www.dannybower.co.uk/photos/Bask2.jpg
http://www.dannybower.co.uk/photos/Bask3.jpg
http://www.dannybower.co.uk/photos/Bask4.jpg
http://www.dannybower.co.uk/photos/Bask5.jpg

[dannybgoode]

And the vivs

http://www.dannybower.co.uk/photos/Viv1.jpg
http://www.dannybower.co.uk/photos/Viv2.jpg
http://www.dannybower.co.uk/photos/Viv3.jpg
http://www.dannybower.co.uk/photos/Viv4.jpg

[Scubadiver59]

When I get my 8'x3'x30" BoaMaster viv for my CP, I'll have Mark V. cut a hole in top for a basking lamp and see what CP does.

All my terrariums all have screens, so I can opt in now, but as of yet, I haven't.

Danny...do you have "sunny" basking days every day, or do you turn them off sometimes, or reduce the voltage, to simulate cloudy days?

[dannybgoode]

When I get my 8'x3'x30" BoaMaster viv for my CP, I'll have Mark V. cut a hole in top for a basking lamp and see what CP does.

All my terrariums all have screens, so I can opt in now, but as of yet, I haven't.

Danny...do you have "sunny" basking days every day, or do you turn them off sometimes, or reduce the voltage, to simulate cloudy days?

I'm pretty basic when it comes to such things and just have the light on all day every day. I may get some digital timers to mix things up a bit in due course. You can't vary voltage to a fluorescent tube - messes them up.

I know some keepers have whole banks of tubes that turn on in sequence to simulate the strengthening uvb rays the sun emits and I'll do this to an extent in my T lepidus Viv at least.

In a Viv that size I'd put a 4' T8 5% uvb tube mounted inside the Viv and have it mounted toward the warm end.

[TRD]

Yes, my MBK is using his UV light on daily basis since the day he got it (I put a T5HO 6% of arcadia over 60% of his vivarium). Now, during the day, he's laying out and basking instead of laying under his rock until lights out.

I intend to extend the provision of UV to all other snakes as well. But first need to organize them all into a new furniture because right now they are standing all over the place.

I'm waiting the new furniture to arrive, then can put my MBK in a bigger vivarium (he's almost 90 cm now and vivarium he's in now is 80 cm... it's big enough but I like to give them space). Then a few others can move one up in size as well as his vivarium becomes available. The other vivariums are now featuring 'basic habitat features' (= normal snake bedding and stuff to climb on/under, heating, etc... no bio-active and planted right now as I prepared for moving them all).

I have all plants ready for the big planting day and most lights. Just need to purchase the UV still... debating with myself if I should supply UV to my albino milk, and if so, how much.


PS.
As for the debate whether or not it is required. No it's not required per se for rodent eaters. But UV helps them, they use it and seemingly like it (as they seek it out). UV helps with immune system, it's not just about D3 synthesis (ie- just like in mammals). So given that a) you can; b) they seem to appreciate it; I see no reason not to do it. The only real thing you need to care for is that you do not provide too much and you give the reptile the opportunity to NOT have any UV. So there should be a gradient to a 0 or close to 0 UV index in the terrarium, and places where there is shadow, even directly under the UV so they can regulate their intake. One should not force it upon them, so to speak.

PPS.
Danny, that Olive in the lower viv really seems to have quite some attitude :) Must be a handful at times heheh

[FWK]

I found the project by Francis Baines you mention. It is certainly interesting, but only seems aimed at estimating how much UV reptiles and amphibians are exposed to naturally, and how to replicate that exposure in captivity. I don't see that it makes any attempt to establish the value of such exposure for rodent eating snakes, and it even warns of issues that exposure can cause, such as skin cancer and vision damage. I only skimmed it briefly though, I will have to read it more carefully when I have more time.

The link for those interested: How much UVB does my reptile need? The UV-Tool, a guide to the selection of UV lighting for reptiles and amphibians in captivity. (http://www.jzar.org/jzar/article/view/150)

[TRD]

Yes that's the aim of that article; to inform people on how to setup UV in a way that is safe for the animals. I think it's very important such information is spread to people as your general petstore is perfectly content to sell you a lamp which has a UVI of 15 at the distance you intent to use it, simply because it's more expensive. That will kill your animal in short order.

The knowledge on UV in a "XL" type petstore that has everything you wish to get close to my home is almost infuriating. I had a talk with the guy managing the reptile department about the dangers the setups pose to the animals (f.e. 10.0 UV light hanging right in the vision of the basking animals (beardies)) and even got him to understand why it's bad only to realize that he simply said "yes" to things to get rid of me as the next time I came (and consecutive times) ... nothing changed. Treating a UV light as a normal light is very dangerous as we humans cannot see those wavelengths and basically without proper knowledge one shouldn't even touch those lights. Perhaps I should ask him to lay 12 hours straight under solarium lighting to get him to understand.

[FWK]

There are more than enough threads covering the ineptitude of pet stores and those who work there. I am interested in establishing the benefits, or lack thereof, of exposing rodent eating snakes to UVB. Anecdotal observations of perceived behavior modification are not interesting.

[Skipper7]

What exactly would you like to see FWK? I can ask Fran if there is any further research available.

Personally I would provide UV, in some form, to most any captive reptile that I have.

[FWK]

What exactly would you like to see FWK? I can ask Fran if there is any further research available.

Personally I would provide UV, in some form, to most any captive reptile that I have.

If I have not stated it clearly enough already, I want to know what benefits exposing rodent eating snake to UVB provides. As someone who keeps quite a few snakes, and takes pride in providing them proper care, this is potentially very important. It has been suggested in this thread that "they hugely benefit" (they being rodent eating snakes) from being exposed to UVB. I want to know how.

[TRD]

There are more than enough threads covering the ineptitude of pet stores and those who work there. I am interested in establishing the benefits, or lack thereof, of exposing rodent eating snakes to UVB. Anecdotal observations of perceived behavior modification are not interesting.

Exact research in this area is limited. There has only been some research in diurnal snakes which shows the health benefits of providing UVB to them. It's a rather new research area..

I'm sure Fran would be able to provide you a multitude of reference materials and information. She has done extensive research into this area and has a veterinary background herself.

Also the article itself contains 1.5 page of references..
https://www.ncbi.nlm.nih.gov/pubmed/18241029
https://www.ncbi.nlm.nih.gov/pubmed/19484753
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427189/

There are many more references but the above are specifically for snakes and benefits of moderated UV radiation in general.

Edit: there should be plenty of easy to find articles on benefits of D3, and benefits of UV exposure in general (same applies for humans as for other species). Humans also don't need UV exposure per se, but not exposing oneself to UV comes also with health risks (decreased immune response, cardiovascular effects, cancers, ...).

[Andy_G]

...and it even warns of issues that exposure can cause, such as skin cancer and vision damage. [/URL]

This is why i'm not sold...If a snake loves their UVB light that's great...but is it worth it if there's a greater rish of developing cataracts after a decade of being under it? I'll let those who really feel strongly about it's benefits use it to find out, not me, at least not right now. I work with eyes for a living so it makes me think about these things much deeper than some.

[dannybgoode]

@Andy. The uv a snake in the wild is exposed to is way way above anything we can provide in a viv. Think of my olive pythons - the uvi index for North West Australia is exceptionally high for example.

In captivity you just need to provide light, shade and the option for total darkness. The snake will then photoregulate much as it would thermoregulate.

Again my snakes demonstrate this all the time. Whilst they all were all out basking at the time of that photo if I went in late morning they'd likely all be hiding.

Note snakes use uvb for much more than just D3 production (although they do use it for that just not to the extent lizards do) but they also see it and use it for visual perception thus not providing uv is depriving a snake of a proportion of its sight, not harming it.

Snakes are incredibly good at sensing their needs and expose themselves to uv as and when they require it but as stated above absolutely they need to be able to get out of it.

Some keepers have been using uv for 10+ years with no ill effects and use it on some very rare snakes and some very expensive collections and do not see it as a risk whatsoever.

I understand your caution but all I can say is try it and you will see positive behavioural changes in your snakes. I'll leave you with this comment from a chap called Francis Cosquieri - a UK resident with a huge and diverse collection (and i quote with his permission):

'It amuses me when people argue until they are blue in the face that these animals "don't react" or "are not affected" by UV.

Contrary to the opinions of some, we don't just pull our opinions out of thin air, rather from actually seeing the differences in our animals.

I freely admit I used to keep many (MANY) snakes in racks and tubs for years, at one point about half of a collection that at the time was over 300 strong.

It was not reading books or papers that changed my mind, it was observing the difference with my own eyes when the animals are provided with this stimulus that convinced me to shift everything I keep over to UV. That was around ten years ago and I have never been more satisfied about my choice than I am today.'

[dannybgoode]

I would also throw a challenge out there. People have asked for papers to show snakes need uv. Is anyone in the contrary side of the argument willing to find a paper (science peer reviewed as was requested of me) that shows snakes do not benefit from uv.

Note I am already aware of the one where all the snakes went blind. That was research by Fran Baines also and she later discovered the bulbs used in the research were defective and emitted strong uvc which was the cause of the blindness. These bulbs are no longer on the market.

[Andy_G]

Definitely some things to ponder, Danny. I can't say that it's a black and white issue, and that intrigues me.

[FWK]

This has reached the point, and predictably so, where I'll just be repeating myself, so I will not post again on this topic unless real data is tabled. You continue to offer only your own anecdotal accounts of what you see as behavior modification as evidence of a benefit otherwise unmeasurable. I understand the benefits you are seeing, and they are entirely your own. You like to be able to see your animals. Humans are highly visual creatures, I get it. The increase in D3 production observed in the paper on Corn Snakes is exactly what we'd expect to see, but extra D3 does not necessarily denote a benefit. Excess D3 is exactly that, and will be filtered out by the body and disposed of. It's like suggesting I would be healthier simply by doubling up on my multivitamin intake. In reality my body would just have to work harder to dispose of the excess. Clearly much more research is needed, but based on decades of highly successful snake keeping by millions of hobbyist and professionals that do not offer UVB I suspect the benefits are likely minimal at best. If you'd like to make a rather silly comparison, for humans the negatives of UV exposure far outweigh the benefits.

It is also worth noting that snakes are largely instinctually driven animals. If they were so good at sensing their needs thermostats wouldn't be so critical as they are. It is demonstrable that certain species in particular (I'm looking at you Ball Pythons) cannot sense surface temperature and will therefor quite literally cook themselves if given the opportunity. Observing that they appear to utilize UVB basking opportunities certainly does not mean they derive any benefit from it. They bask because instinct dictates them, not because they are aware of a benefit. It is up to us to determine what they do and don't need, and provide the proper conditions accordingly. Thus far I have seen no evidence to even suggest that rodent eating snakes benefit from UVB exposure.

[fedeCF]

I'm sharing here two great answers about the UVB for snakes debate.
One is from John Courteney-Smith HERE (https://docs.google.com/document/d/19WDzEwPwNhGzTc9S-tQhewsaKfcjHWXQGdTgGbgHHYc/edit?usp=sharing)
The other is from Frances M Baines HERE (https://docs.google.com/document/d/15QSgj76S_VXIBl4fEfBq5cVYo46IS6JRh9iLIfPgKYA/edit?usp=sharing)

These files are shared on my google drive as I can't find the original source at the moment.

I think is is a good read and with some good points on the matter.

[Andy_G]

The one by John Courteney Smith mentions that UV lighting helps with shedding and growth...I have to mention that I've never used UV lighting for snakes yet have never had slow growers or bad sheds aside from perhaps a handful of tail tips over the years... Nothing mentioned about relative humidity, substrate choices, different prey items and the differences in nutrition...just UV. How can that not be regarded at best as extremely subjective?

The second paper has the following; "..This paper does not, however, establish whether snakes do synthesise vitamin D3 in the skin..." "...Nature typically utilises free resources very effectively; we should not be surprised if it turns out that very few snake species are unable to synthesise vitamin D3 in the skin under natual UVB light." It also goes on to mention that there is less risk of skin damage from the sun in comparison to one of the products studied.

@ Danny, that paper above mentions that it was actually a light with high UVB output, not UVC as you mentioned...I believe that's the same paper you're referring to? I will continue to use LED light in my vivs to enhance aesthetics. Practically everything so far I have read including what you has posted in months' past, although creating a bit of a grey area rather than black and white and very intriguing, seems subjectively biased. As far as your challenge is concerned, the desire for me to prove what you're asking simply isn't there. Why you ask? Well, when a new idea or method of keeping is domonstrated and the goal is for it to be accepted, it should really be proven in order for that to happen, not the other way around. I'll use UV lighting when it's demonstrated objectively that there is a benefit and will continue to raise, breed and sell perfectly healthy snakes without it just like the thousands of breeders before me. You will use UV because you think your snakes benefit from it, and there's nothing wrong with what either of us are doing at the end of the day. Still skeptical...intrigued...but skeptical.

[eminart]

This has reached the point, and predictably so, where I'll just be repeating myself, so I will not post again on this topic unless real data is tabled. You continue to offer only your own anecdotal accounts of what you see as behavior modification as evidence of a benefit otherwise unmeasurable. I understand the benefits you are seeing, and they are entirely your own. You like to be able to see your animals. Humans are highly visual creatures, I get it. The increase in D3 production observed in the paper on Corn Snakes is exactly what we'd expect to see, but extra D3 does not necessarily denote a benefit. Excess D3 is exactly that, and will be filtered out by the body and disposed of. It's like suggesting I would be healthier simply by doubling up on my multivitamin intake. In reality my body would just have to work harder to dispose of the excess. Clearly much more research is needed, but based on decades of highly successful snake keeping by millions of hobbyist and professionals that do not offer UVB I suspect the benefits are likely minimal at best. If you'd like to make a rather silly comparison, for humans the negatives of UV exposure far outweigh the benefits.

It is also worth noting that snakes are largely instinctually driven animals. If they were so good at sensing their needs thermostats wouldn't be so critical as they are. It is demonstrable that certain species in particular (I'm looking at you Ball Pythons) cannot sense surface temperature and will therefor quite literally cook themselves if given the opportunity. Observing that they appear to utilize UVB basking opportunities certainly does not mean they derive any benefit from it. They bask because instinct dictates them, not because they are aware of a benefit. It is up to us to determine what they do and don't need, and provide the proper conditions accordingly. Thus far I have seen no evidence to even suggest that rodent eating snakes benefit from UVB exposure.


I began typing out a very similar, yet somewhat less coherent response earlier, but decided to just delete it. But, since you've said it so well, I'll just piggyback and say, "Ditto."

I'm open to the possibility that UVB might benefit rodent-eating snakes, but I'm going to need some real data to believe it. It just seems very unlikely they get much, if any benefit from it.

[dannybgoode]

For what reason do animals have instincts though? They are survival mechanisms so inherent in a species the behaviour is genetically coded.

It is generally only vital or very beneficial behaviours that become instinctive ones. Why is it snakes preferentially seek a uvb source over a non -uvb source (yes there are papers proving this behaviour).

And as I say snakes see far in to the uvb portion of the spectrum so to not provide it is to deprive them of a good deal of visual sensory information. Ok this information may not be essential or even required for health of survival but you wouldn't keep a dog and cover one of its eyes for example.

I guess much of this depends on husbandry philosophy and that's not meant as a criticism even though I appreciate it may come across as one. I will spend more on a setup than the average keeper because I want to keep my snakes as naturally as is possible given the available technology. In nature they have the option of uv exposure so I provide it I captivity.

I will post the details of a whole host of papers as well.

And as I say - my challenge is there also and i think it a fair one. You've asked for and courtesy of TRD have been provided with some papers suggesting uv to be beneficial. Equally I am asking for papers showing it is not beneficial because thus far your counter arguments are only anecdotal.

It is not a fair debate if we are not allowed to rely purely on anecdotal evidence but you are. You are asking for the science - so am I :)

[Scubadiver59]

I did warn the OP in my post at the very beginning that this was a hotly debated subject...so far I haven't been disappointed!

Hopefully the OP is enjoying themselves!! :rolleyes:

[dannybgoode]

The one by John Courteney Smith mentions that UV lighting helps with shedding and growth...I have to mention that I've never used UV lighting for snakes yet have never had slow growers or bad sheds aside from perhaps a handful of tail tips over the years... Nothing mentioned about relative humidity, substrate choices, different prey items and the differences in nutrition...just UV. How can that not be regarded at best as extremely subjective?

The second paper has the following; "..This paper does not, however, establish whether snakes do synthesise vitamin D3 in the skin..." "...Nature typically utilises free resources very effectively; we should not be surprised if it turns out that very few snake species are unable to synthesise vitamin D3 in the skin under natual UVB light." It also goes on to mention that there is less risk of skin damage from the sun in comparison to one of the products studied.

@ Danny, that paper above mentions that it was actually a light with high UVB output, not UVC as you mentioned...I believe that's the same paper you're referring to? I will continue to use LED light in my vivs to enhance aesthetics. Practically everything so far I have read including what you has posted in months' past, although creating a bit of a grey area rather than black and white and very intriguing, seems subjectively biased. As far as your challenge is concerned, the desire for me to prove what you're asking simply isn't there. Why you ask? Well, when a new idea or method of keeping is domonstrated and the goal is for it to be accepted, it should really be proven in order for that to happen, not the other way around. I'll use UV lighting when it's demonstrated objectively that there is a benefit and will continue to raise, breed and sell perfectly healthy snakes without it just like the thousands of breeders before me. You will use UV because you think your snakes benefit from it, and there's nothing wrong with what either of us are doing at the end of the day. Still skeptical...intrigued...but skeptical.

You can ask Fran directly - it is her who has corrected her own research as that paper is somewhat old.

As to breeding success I don't think breeding in and of itself is proof of good or bad husbandry. Many animals will breed successfully in substandard conditions - think of puppy farms. Even humans will breed under sub par conditions.

Indeed I can post details of a recent paper that specifically demonstrated snakes breed when stressed.

Note I'm not for one minute suggesting you or anyone else on here keeps their snakes in substandard conditions - simply that breeding success is not necessarily an outright indicator.

As I say - why not try it with one of your snakes and see if you notice any behavioural changes. I was sceptical and tried it with my boa and the change was pretty immediate and very noticeable.

Francis Cosquieri who I cited earlier spends many $1000's a year on tubes so convinced is he both through the research and his own observations. By his own admission be wished that it was demonstrably shown to be not required as he would save himself a fortune.

TRD was sceptical and tried it and was very surprised by the results.

I will post details of plenty of papers also.

Ultimately yes it's a choice but when someone asks question is uv required the answer 'no' should be supported by the science to back it up just as the answer 'Yes' should be.

TRD and others have provided some papers to support the yes camp and i will post more later. I'm still waiting for papers to support the no camp.

[fedeCF]

I just found some more interesting articles related to snake and uvb light exposure. Ore is just an exerpt from an article published on zoo biology, vol 29 issue #3. The link here (http://onlinelibrary.wiley.com/wol1/doi/10.1002/zoo.20255/abstract).

The other is from a senior thesis that study how UVB Radiation Affects the Quality of the Female Sexual Attractiveness Pheromone of the Red-Sided Garter Snake. Here the exerpt (http://ir.library.oregonstate.edu/xmlui/handle/1957/26023) (with a link to download the .doc file)

[fedeCF]

Also this (https://drive.google.com/file/d/0B3JnwfgOG8E3a0M3VEc5MEtjWU0/view?usp=drivesdk) research.

It's entitled Production of cutaneous vitamin D3 after UVB
radiation in reptiles and amphibians. In the species studied ball python and boa constrictor are included together with few other snakes

[chairman]

Providing low level uvb for snakes can be cheap and easy... virtually all commercial fluorescent bulbs emit uvb. Even compact fluorescents emit some uvb. The amount isn't enough for species that genuinely require uvb for basking.

I have used compact fluorescents to provide lighting in cages in the past. The common cfl bulbs generally raised ambient temperatures by about 5-10 degrees Fahrenheit and the surfaces of the fixtures approached 100 F, a pretty popular basking spot surface temp for many species. The only behaviour changes that I observed were consistent with seeking heat, but then again I'm really only familiar with uv basking indicators in lizards and turtles. I can't say that I noticed any other improvements but then this was very low level uvb exposure, not a bulb designed to maximize its output.

[Skipper7]

Sorry for th late reply FWK. I heard back from Fran and she sent some papers. I'll read through them tonight and then post them here.

EDIT: Will have to wait till I have access to my computer. Can't open the Dropbox file on iPad.

[TRD]

Actually it is shown that snakes synthesize D3 through their skin;
https://www.ncbi.nlm.nih.gov/pubmed/18241029

Reptile vision also requires the availability of UVa, as well as the research that snakes have far better eyes than is generally assumed in the hobby (ie- most people think they have limited vision);
http://jeb.biologists.org/content/jexbio/202/14/1931.full.pdf

Some species are truly daytime basking and do not have a diet of 100% rodents. F.e. grass snakes, garter snakes, ... these species benefit hugely from UVb exposure. Also in the wild you'll find them basking in the sunshine all the time.

In general some species are considered in the hobby of no need for UV, like Crested Gecko's, or Leopard Gecko's.. yet we have to supplement them with D3 - I wonder why.

There are more papers on the benefits of UV. You could find many of the AAH FB group, or on websites dedicated to UV lighting for reptiles like UV Guide UK - Ultraviolet Light for Reptiles - UVB reptile lighting on test (http://www.uvguide.co.uk)

I'm not so short sighted that I would say "snakes need UV" but I do believe that adding proper UV lighting has health benefits. I can tell from my own experience that my snakes are now open and active during daytime, basking and doing their thing, and I keep primarily kings and milks who previously where hiding all day every day. They only started to come out and bask after I added UV light. That must mean something.

[pinefamily]

I've been following this thread with interest. This has been a widely debated topic here in Australia as well.
General consensus over here is that, while it doesn't harm them, UV is not essential for Aussie snakes. No, I don't have any papers or research to back that up, only anecdotal evidence from people that have been in the hobby for decades.
From my own experience, the only snake we ever offered UV to actually lightened in skin colour. Our bredli turned a very pale tan colour. Once again, only an anecdote.

[dannybgoode]

I've been following this thread with interest. This has been a widely debated topic here in Australia as well.
General consensus over here is that, while it doesn't harm them, UV is not essential for Aussie snakes. No, I don't have any papers or research to back that up, only anecdotal evidence from people that have been in the hobby for decades.
From my own experience, the only snake we ever offered UV to actually lightened in skin colour. Our bredli turned a very pale tan colour. Once again, only an anecdote.

Which is kind of funny given you guys have one of the highest UV indicies in the world. I'll take science over anedoctes any day. There are so many papers now that show uv to be highly beneficial that to me it's a no brainer.

I would also suggest that the skin turning paler would suggest that the snake was trying to absorb more UV and thus was benefiting from it. Paler skin generally = higher UV absorption. Also snakes often 'colour up' under UV.