I haven't had any bites that draw blood, just ones that leave bruising. Some of them were accidental during play or redirected because the animal was in pain, so they weren't all aggressive. I think the only animals have been cats, dogs, ferret, rat, hamster, goat, goose, fish, parrot, and pigeon. I've gotten nipped a little while hand feeding other animals but I don't really count that as a bite.