Ah the terrible two's He is testing you to see what he can get away with. If his wings are not clipped Clip them now ground him. Make him a time out perch some were off to the side not in direct contact with any one. The perch should not have any toys or food near maybe a little water would be OK. When he bites take him to the time out perch for a three to five minute break.
Just never mistake a testing as a bite GCC's will test every thing with their beak they may test your finger to see if it is steady enough to step up to.
If it is not bleeding it probably was not a bite
