Observing a cockatiel’s behavior and body language is key to understanding its mood. Happy cockatiels often exhibit playful behaviors, sing, and interact energetically with their environment or their humans. They might also fluff up their feathers and then smooth them down. On the other hand, signs of distress or discomfort in cockatiels can include feather plucking, retreating to a corner of the cage, or changes in vocalization patterns. Consistent observation will help you notice deviations from their normal behavior, indicating changes in mood or health that may require closer attention or veterinary care.