male cockatiel (nymphicus hollandicus) perched on a tree in a zoo : (pix sanjiv shukla)

cockatiel nymphicus hollandicus weero weiro quarrion parrot parakeet cockatoo endemic australia pet bird companion breed cage crest subfamily nymphicinae family cacatuidae wetland scrubland bushland vertical startle excited oblique relax head angry defensive long tail feather grey wild plumage white wing male yellow face female orange ear cheddar cheeks vocal sing melody human word phrase learn imitate environment sound arid nomadic food water flock group pair