Rocky55

Can anyone tell me ,why my grey bites me out of the blue??.I have held him play with him scratch his head ,then when he is on my hand he will just bite me,he has left 3 good cuts on my hand.what do i do to correct this problem.when he bites i say nothing but put him back in his cage which he does not like any help thank you.Rocky55

i feed Harrison's adult life time,do i have to feed seed mixture with this??