In the wild, you’ll see immense flocks of cockatiels circling the sky in search of large bodies of water where they can rest, breed, and escape from the Australian heat. Cockatiels are very sociable birds and will get depressed if they are left alone for long periods of time. They may hit their heads against cages, pull their feathers, refuse to eat, or become angry. It’s best to get a pair of cockatiels if you know you’ll be out of your house for long periods of time. Source: Cockatiels