Cockatoo crest open

Cockatoos are psittacine birds famous for their erectile crest, used for visual communication during courtship and alarm.

About this subject

Cockatoos belong to the family Cacatuidae, native to Australasia (Australia, Indonesia, Philippines, and New Guinea). They differ from other parrots by the presence of a crest, elongated feathers on top of the head that can be raised or lowered voluntarily. Crest opening is associated with intense emotional states: excitement, fear, aggression, or displays of affection. In species such as the white cockatoo (Cacatua alba) or the Moluccan cockatoo (Cacatua moluccensis), the crest forms a striking fan that contrasts with the light plumage.

This behavior has crucial social functions. In flocks, an erect crest signals dominance or submission during disputes over food or mates. During breeding season, males display the fully opened crest, combined with vocalizations and dances, to attract females. The ability to control each feather individually allows subtle expressions, a half-opened crest can indicate curiosity or attention.

The muscles that move the crest are highly developed. Unlike birds that rely only on involuntary erection via blood flow, cockatoos have erector muscles that actively lift the feathers. Ethological studies show that chicks begin using the crest around six weeks of age, initially in response to stressful stimuli, later refining the movement for social interactions.

Interestingly, the crest also serves thermoregulation. On hot days, cockatoos may keep the crest open to dissipate heat. In danger situations, a sudden crest opening startles predators, giving the bird time to flee. The crest feathers are longer and less dense than body feathers, allowing wide movement. Some species, like the palm cockatoo (Probosciger aterrimus), have bristled crests resembling a crown, while others keep it discreetly lowered most of the time.

Frequently Asked Questions

Why do cockatoos open their crest?

Opening the crest is a form of visual communication. It can indicate excitement, fear, aggression, mating desire, or a simple reaction to environmental stimuli. It also aids in thermoregulation.

Do all cockatoos have a crest?

Yes, all cockatoo species have a crest, though size, shape, and color vary. Some have very showy crests, like the Moluccan cockatoo, while others have subtle crests.

Is the crest of a cockatoo voluntarily controlled?

Yes, cockatoos have specific muscles that allow them to actively raise and lower the crest. This gives them the ability to express different moods and social intentions.