Oh, actually quite a lot.
I dislike the gorillas (they're super intimidating o-o), the frogs, 90% of the time I end up hating the mice, every duck but Molly, the monkeys...
Edit: Almost forgot, mammoths and rhinos.
Argh.
Alligators (minus Gayle), bulls/cows, dogs (except Cookie and Goldie),
gorillas (I can't stand any of them at all!), hippos (they have such huge heads! ), rhinos, octopi, and monkeys.