It depends on the lizard, its age, its size, and a lot of other factors.Some are vegetarian, some are carnivores, some are omnivores, and still others are scavengers. The most common in the US, the Anole lizards (the smooth skinned green or brown color-changing varieties), will eat pretty much anything from apples to smaller lizards.

 Breakfast is a must...maybe some leftovers from insects captured last night...brunch if stumbling over an early worm...lunch by noon on water seeking smallier reptiles and itself for dinner when captured by a fox or bird, The End.