Ohoho~ I love me some SQUIRRELS, followed closely by deer/goats (half of them look the same to me idek), cats and bunnies. Honorable mention goes to the cubs, though. I thought I'd love the hamsters but Flurry's lack of a nose creeped me out majorly for the brief time I had her so now I'm not too sure about them.
I can definitively say I dislike wolves (Skye is the only exception tbh), hippos and horses. But you could not PAY ME to keep a monkey or gorilla type villager in my town. Do not want.
I like most of the species in Animal Crossing, but I think my favorite species would be a tie between wolves and deer. They're all just so adorable. c_: