The position of a cockatiel’s crest feathers can tell you its mood. Straight-up crest feathers can mean the bird is startled or highly curious. A defensive cockatiel will hold its crest feathers flattened close its head, and it might be especially stressed if it also hisses. A relaxed cockatiel will have slightly held back crest feathers, as well as fluffed cheek feathers and you might also hear it contently grinding its beak. Source: Lafeber
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