Hello all,
I have a 1 yr old, fixed, male squirrel named Parkour whom I’ve raised since his early, early infancy.
I’ve heard of “wilding up,” I know how squirrels play, and (I’m new but) I’ve seen post on here about biting. But the thing is, sometimes he bites hard. It’s an angry biting almost as if I had hurt him or startled him. Today, he jumped into my hands as he always does, let me quietly stroke and scratch him, then he snapped and bit my hand. There’s a was a distinct crunch (ya know, when it breaks skin) and this’ll be the second, maybe third, time he nailed a vein.
I really just want to know if this is common, part of the squirrel-owner experience, or if this can be avoided.
Also, he’s been to the vet and he’s in perfect health, not even overweight, so I don’t believe there’s an ailment that’s irritating him.

Tl;dr Pet squirrel with good health bites hard enough to break skin, all to often. Is it “normal?”