Some bird species, such as macaws and cockatoos, sometimes make this sound by popping the tip of their upper beak against their lower beak. Cockatoos often seem to make a clicking noise with their tongues. Other species like African grey parrots appear to reproduce the sound of a click in their throats.
This seems to be a comfort or happiness behavior with many parrots, and others seem to use it as a friendly greeting. When meeting a parrot for the first time, many seem quite pleased when new people make soft clicking sounds with their tongues. Many birds will come closer and make clicking noises in response. Even for people who are not talented in mimicry, this can be an easy sound to replicate.
Nothing negative about beak clicking behavior, so keep on clicking!
Disclaimer: BirdChannel.com’s Bird Behavior Index is intended for educational purposes only. It is not meant to replace the expertise and experience of a professional veterinarian. Do not use the information presented here to make decisions about your bird’s health if you suspect your pet is sick. If your pet is showing signs of illness or you notice changes in your bird’s behavior, take your pet to the nearest veterinarian or an emergency pet clinic as soon as possible.