That was a nice summary. Most of the info is pretty accurate as far I can recall. New2BP - when you say "in depth" I'm not exactly sure how detailed you mean. If you already have a science background and are looking for a full blown scientific journal article you could check out this reference:
Campbell et al., Biological infrared imaging and sensing. Micron. 2002;33(2):211-25
It's a good review article that deals with heat sensing in various animals. I remember that it had a fairly detailed section on the structure and function of IR pits in snakes. I think the pdf is available for free on Pubmed.
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