He snaps off a suitable branch, grabs it with his foot, and taps it on a dead trunk. At the same time, he spreads his wings, fans out his crest, sways his head to and fro, and emits high - pitched shrieks ​ — truly a spectacular performance!
وذكر ببغاء الكوكاتو الاسود الكبير الاوسترالي يستخدم كل وسائل الاتصال حين يعلن حدود منطقته ،‏ فينقر ،‏ يغنّي ،‏ يؤدي حركات ايقاعية ،‏ ويعرض ريشه .‏