Amazons are like that. The biting comes and goes with the breeding season. Usually it’s worst in the spring time.
The quail etc are pretty helpless, but Lucifer has a beak that is made to crack all kinds of nuts – he can crack your finger bone easily. So, the bites you do get are “gentle corrections”.
Yeah, right, I know! I have been bitten many times. It hurts like hell! But it is true, he thinks he is being gentle about it. You don’t want to be on the receiving end when he is really angry.
Lora, the military macaw, would have no trouble severing the finger. The pressure she can excert with that beak is enormous. I have always marvelled at how they can raise these minute offspring without hurting them. Amazing.