Papageien » my grey is biting the other when it tries to get food

Hello,

my grey is biting the other when it tries to get food
this is new behavior ...could it be bc of hormones? im clueless here ... im still still learning these guys and gals ..
and im learning about birds as well since my mom get them from an auction and didnt ask anything about
their history ... idk what to do?

Please help.

I didn't find the right solution from the Internet.

References:-
http://www.parrotforums.com/questions
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Thanks