Tyson was not i a right frame of mind during those days, and in his mind, he was responding to the elbows he received from holyfield.
That does not excuse his behaviour though, but I think we understand his mind set a little better.
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He never bit it "off"
There were two bites total. The first resulted in a 2 point deduction, the second resulted in a fight stoppage. The second bite was the famous one that we see most of the pictures of.
Evander Holyfield; in the 1997 rematch. Mike was disqualified for biting off a piece of Holyfield's ear and his license was revoked. In 1999 Tyson regained his boxing license and returned to the ring.
Mike Tyson bit Evander twice during that particular match because he said Evander was getting away with "head-butting" him.