The eggs hatch in August. All five species of Iowa's lizards eat small invertebrates such as crickets, grasshoppers, beetles, spiders, caterpillars, which they chase down and eat. They mash their food up with their strong jaws before swallowing it. Glass lizards are able to eat larger foods because they attain larger sizes than our other lizards. Small snakes, lizards, eggs, rodents, and other prey is consumed in addition to insects.
Pesticides take a toll on glass lizards because of their insectivorous diet.