Cockatiels are small, slender parrots native to Australia and the smallest members of the cockatoo family. They are known for their tuneful whistling and ability to mimic sounds and words. Appearance: Yellow with rosy cheeks, a long pointed tail, and a crest that raises when excited. Males have distinctive orange cheek patches and yellowish faces and crests. Size: 11–14 inches long and weigh 2–4 ounces.