Re: Megalania (Varanus priscus)
The venom is apparently fairly rudimentary and acts mainly in reducing blood pressure and slowing coagulation/clotting. Bryan's theory is that it may induce shock, causing the prey to succumb more quickly. Given that most monitors prey on animals much smaller than themselves, it's debatable how useful this would be most of the time, but I guess every now and then they do prey on animals large enough to cause a bit of a struggle so it would be helpful then.
I've been bitten by juvenile lace monitors and I can definitely say the bites bleed profusely and also sting a lot more than one would expect from the physical damage alone. Apparently some of the smaller 'dwarf' monitors have particularly painful bites.
The interesting thing about Megalania (which I think has since been included in the genus Varanus) is that it wasn't the only huge monitor to have appeared in Australia in prehistoric times. A series of fossils has been discovered which suggest that Australia was the original home of the Komodo dragon and its relatives, (not just Megalania prisca/Varanus priscus), for they seem to have evolved here. That makes sense, considering that the Komodo dragon's closest living relative is the lace monitor.
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