Umbrella cockatoo exhibiting 'alert' display. Species and individual variation dictate how a parrot in this 'state' should be approached. (Greg L. Harrison).

Figure 3-3-2. Umbrella cockatoo exhibiting "alert" display. Species and individual variation dictate how a parrot in this "state" should be approached. (Greg L. Harrison).

Wilson, L. and Lightfoot, T.L. Concepts in Behavior - Section III: Pubescent & Adult Psittacine Behavior. In: Harrison G.J. and Lightfoot T.L. (Eds.), Clinical Avian Medicine. Ithaca: International Veterinary Information Service (www.ivis.org), 2006; Document No. A3808.0506.(Accessed: 19 Nov 2017).