Cockatoos are high-strung, sensitive and manipulative birds. A cockatoo naturally has morning and evening periods of boisterous glad-to-be-alive screaming. This is at a decibel level that numb eardrums. While they feed on the ground, eating seeds, nuts and grain, they post look-outs in the tops of tall trees to sound the alarm if any danger approaches. They are very clever birds and wonderful mimics, - a white cockatoo can even learn to mimic your voice!