I finally got a copy of Chickens for Dummies from the library today! I haven't read the whole thing, but I have read bits and pieces here and there (as much as a 7 month old infant will allow anyway) and one of the things I found fascinating was the myths and misconceptions chapter. It says that chickens can count and understand the concept of zero. My question is, how do we know they understand the concept of zero (or any other number for that matter)? If anyone has any links to the research I would love to read more about this, and my friend who teaches an animal behavior course for a private college and I'll bet she'd love to read up on it too.