Cockatiels

Distribution
Cockatiels are native to Australia, where they are found largely in arid or semi-arid country but always close to water.
Diet
Mostly eat seeds.
Information

The cockatiel's distinctive crest expresses the animal's emotional state. The crest is dramatically vertical when the cockatiel is startled or excited, gently oblique in its neutral or relaxed state, and flattened close to the head when the animal is angry or defensive. The crest is also held flat but protrudes outward in the back when the cockatiel is trying to appear alluring or flirtatious.