The mental health of your cockatiel is very important.
Cockatiels need games and toys. They need to hear sounds and see objects. In other words, they need mental stimulation, or they may go as "crazy as a loon," or become as "dumb as a dodo bird."

Cockatiels are playful birds and they like interaction. Remember, you are responsible for your cockatiel's physical and mental health. If you were kept in a small room for the rest of your life and given your food but no companionship, how would you feel and what would you do? Think about this and try to make your bird's life as pleasant as possible. You will be greatly rewarded with a happy bird that will give you years of joy and pleasure. If you have provided for your cockatiel's physical and mental needs, you should have a happy, friendly cockatiel and a good pet. But always be on the lookout for any developing problems and try to find their cause. A few signs that your cockatiel might suffer from mental stress:

• Agitated hopping or flying from perch to perch
• Feather picking
• Toe chewing
• Excessive aggression
• No interest in playing, singing, talking.