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How to feed a cockatoo 
Purchase pellets formulated for cockatoos. 
Pellets are made from ground nuts and seeds and are formulated to meet your cockatoo's dietary needs. While your bird will not want to eat only pellets, it's important that most of its diet be made up of pellets.
Birds can easily suffer from malnutrition if they don't eat a balanced diet. Pellets should make up about 60% of the bird's diet.