Assertion: cockatiel | /r/CapableOf | back into corner
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text: Cockatiels will always give you a warning sign before biting: hissing, tail fanning, eye pinning, backing into a corner, swaying from side to side, moving away from you or turning their back on you, lifting 1 foot, moving wings away from body, puffing out and lunging towards you with an open beak, like Mama is doing in the left picture above.