Small cockatoo is angry, he is clearly dissatisfied with something, and shows it in all possible ways. Many owners of birds, especially parrots, are faced with the same problem – their Pets bite.
Parrots have large beaks, so that the injury caused by the bite can be very serious and such behavior birds needs correction. You can try different ways of influencing the harmful parrot before looking for him a new master. Why do birds bite?
This may be various reasons and you really need to understand why your bird bites. This will affect the choice of technology, with which you will fight with this habit.