Fridge Logic: Why would so many of these characters not know about their own species' life cycles? For example, why would 20-something year old rabbit only recently discover that he changes color in the spring? Wouldn't he have changed color every year prior to that? For the added bonus, he didn't even know what species of rabbit he was.
Somewhere, a Mammalogist Is Crying: In the stinger for an episode in which a raccoon has been stealing things (the stinger during the credits always gives additional facts about the natural phenomenon of the episode), raccoons are referred to as "rodents." In reality, they are procyonids.