I, for one, need to learn some new terminology for "biting" behavior. When our Lovebirds bite, there's generally blood involved (and sometimes punctured fingernails, etc.).
On the other hand, Sammy (my yellow-naped 'Zon) has several levels of "bites" (well, beak-to-skin contact). The normal type isn't so much a bite, as a gentle scrape with the open beak, coupled with a light rub with his tongue, like he's enjoying the texture of my hand. This variety never leaves a mark, and gives not the slightest discomfort.
The second is a kind of "play bite", when I'm trying to get him to step up & he's feeling playful ("C'mere, c'mere, no, get away, get away!"). While his beak is open, the contact is more of a playful poke (he enjoys this immensely!) and, again, there is never any hurting to go along with that.
The third is if he is truly afraid or genuinely angry (such as when he's on my shoulder and my wife gets too close to me), and that is a truly FIRM bite. He has never drawn blood on one of these, but the deep indents leave no doubt that they were right on the edge. I can generally see these coming, and do my best to avoid them - not for my sake, but to avoid the stress that Sammy is obviously feeling.
The last type isn't a bite of any kind, really, but a truly lovable beak-to-lip contact, when he's feeling particularly cozy, safe & protected. He puts the side of his beak up to my lip, opens his beak, and gently touches my lip with his tongue. Everyone in the room invariably goes "Awww!!!".
Anybody have any commonly-used terms for these (aside from the fear/jealous bite, of course)?