self control

I dunno why, but my IRN hates my lovebird Coco, who is the sweetest creature ever. :( When he (I assume, maybe she) sees Coco near him (and she won't leave!), he fluffs up, pins his eyes, opens his beak to attack, hears my "Riko, NO!!!"... and lowers his head, closes his eyes for a while, and...