Cockatiels (binomial name Nymphicus hollandicus) are small birds originally from Australia and are related to many other cockatoos. They are the second most common bird species kept as a pet. Cockatiels can live from 10 to 25 years, depending on how healthy their lifestyle is, although wild cockatiels usually live shorter.
Cockatiels have tiny feathers on their head called a crest. The crest allows the owner to have an idea of what they are feeling; straight up if scared or excited, flat when they're angry, and slightly curved is normal/happy.