Hmm, mine eat everything that everyone one has mentioned. I have a very large lobster colony and they ate a small rat that my burm wouldn't eat. They will eat beets, carrots, dark greens, tortoise food, ig salad, cantaloupe, watermelon, dog food, mice, mouse chow, rat chow, fruit loops, raison bran, egg yolks, dried fruit mix, potato chips, wood shavings, grass clipings, yogurt, cheese, cherries, oranges, strawberries etc.... I heard that orange heads ate live insects so I tried it with crickets and well they do. Most of mine will eat earthworms...
I always thought that they will eat anything, one thing I haven't tried is the glue on the back of post-it's which is a common urban myth, but since mine will eat their egg crates if they run out of food while I'm at school I am assuming they will eat paper and the glue along with it.