My parakeet won't eat anything but seeds... How can I get him to eat other things?
You need to know what parakeets like. If you feed them anything they can not handle they will not eat it. They feed on vegetables, cereals, fruits and flowers. For more details and examples, check out http://www.ehow.com/info_12002541_can-feed-parakeet.html.
Seeds are their natural food, why do you want to change it??