The behavior of a cockatiel when it is angry:

1. When a cockatiel is angry, it does not like to talk to its owner. Even if the owner talks to it, it still feeds it. It doesn't eat or care about anything. They may even show obvious boredom or retreat to the corner of the birdcage.

2. When a cockatiel is angry, it is likely to attack its owner. When the owner feeds it, the cockatiel may bite the owner's hand. After being released from the cage, it may rush directly to the owner's face and peck the owner's face and mouth with its mouth.

3. When a cockatiel is angry, its eyes will dim, the crest on its head will fall down, and it may even cry sadly in a low voice.

Causes that make cockatiels angry:

1. Cockatiels are easily angry during the estrus period, because the parrots at this time have unstable temperaments and are very irritable. .

2. If the owner does something that makes the cockatiel unhappy, it will also make the cockatiel angry. For example, the owner neglects the cockatiel, or a new bird makes the cockatiel jealous.

3. The owner doted on the cockatiel too much when the parrot was young and did not train it correctly, which would also lead to its temper not being gentle enough, and it would like to be willful and mischievous.