So I picked up this book at the used book store last weekend
Nonvenomous Snakes : Ludwig Trutnau (Hardcover, 1986) - eBay (item 341401338081 end time Feb-04-35 06:48:01 PST) As I was paging through it, I stopped at the section on sensory organs. And I found this....
"
Some snake families (boas and pit vipers) also have heat sensitive organs located in pit like depressions on the head which sense the body heat of warm -blooded animals........."
My first thought as I flipped to the fly leaf to see the publishing date was, Wow talk about reverse evolution and only 30 years! Then I saw it was originally published in German and thought it must have been a translation error.
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