Everyone is right, you just have to find out what he likes. It will take time.
For Makena it is dried noodles or popcorn... He is obsessed with both! All I have to is rustle the noodle bag and he is ready to do anything I want him to :P
Some people give their birds dairy, we choose not too as they can't digest it. They are lactose intolerant. It's your choice. We also don't give peanuts or peanut butter due to being paranoid about aflatoxins. Maybe we are a little tooooooo paranoid!!
Beccy, Mak is the same way. He is completely uninterested in nuts...LOL! I offered him a pecan when I was making a pie and he didn't want any part of it!