I didn't vote because I have different answers depending on which pet we are talking about.
Out of the dogs Buster is the only one will get a little nippy if he is jealous, but he has never really bitten.
Sometimes my kitties give little love bites, mostly Jimmy.
The chinchillas have never attempted to bite, nor has my bunny or mouse. Wyatt has bitten me once.
I was bitten by Flick, our rat snake once, totally my fault. Justin was bitten by Angel our red tail boa once, also his fault.
Out of the birds Oscar, Casper, and Charmin have never bitten. Baby has mood swings and is usually really good, but has bitten me once or twice and has attempted a few times. Romi, the lovebird, is a bad biter. Skye, Doodle, and Max are sometimes bitters too.