Their intelligence can be seen early on and they can be taught to preform tricks. Outfitting a Blue Crown's cage with natural perches is a must. Those strong beaks enjoy tearing the bark off of the branches. Then they will likely shred the branches into toothpicks. In addition, have an ample supply of wood toys to further enhance their chewing desire.
Leather strips are also a favorite.
Rotate the toys weekly to prevent boredom. Foot held toys are also relished. Feeding your Blue Crown a varied diet will contribute to longevity and health. Fruit seems to be a special favorite among Blue Crowns, especially grapes. My pairs will fill up on the fruits and leave the veggies, so I limit the amount of fruit and I hide it in the bottom of the dish.