While I realize that I am taking a risk, my birds love to trim off the leaves and then shred the bark. Place the perches so droppings will not fall on other perches, water, food or bath dishes. Because the baby cannot fly in the confines of the cage it is important that the perches be placed so that the bird can climb from perch to perch and over to water and food dishes. He eats seeds, fruits, vegetables, and pellets. This is a well-balanced diet.
Corn is especially important in their diet.
These could make him ill and possibly be life threatening. Bacteria and fungus are far more dangerous to birds than it is to people. Buy dried fruits and vegetables at bird specialty stores if you are concerned about leaving fresh foods in the cage during the day. It only takes a second to change water. Birds nibble on everything.