Cuddly, outgoing and comical are just three reasons why the cockatiel is the No. 1 pet bird in America. Cockatiels are also talented whistlers, and male cockatiels in particular are known for their whistle serenades, which can be directed at their favored person, their favorite object or their mirror reflection. When not whistling or keeping themselves busy foraging for food and fun around the cage, cockatiels often enjoy spending their downtime snuggling on their favored person’s shoulder. A healthy, well-socialized cockatiel can make a great class pet.