In my perpetual quest to discover how many nipples our various mammal relatives have, I came across this invaluable resource - the American Society of Mammalogy's ongoing publication:

http://www.science.smith.edu/depart.....i/default.html

Papers 1-807 are available free online, and later editions will no doubt appear as time goes by. It doesn't have every species in it yet. For example, a lot of primates, including the gorilla, are missing.

The easiest way to navigate it is to use the order list in the left-hand column to find your species (the vast majority of beasts of interest to the furry fandom will be found in the order Carnivora, of course), then take note of the number of the pamphlet and go to the PDFs page to find it.

I have just used it to find out how many toes red pandas have, and along the way discovered they apparently don't have pads.