The Southern alligator lizard is found in a variety of habitats from grassland and chaparral to oak woodlands and edges of open coniferous forests, as well as riparian zones and moist canyon bottoms. It requires thickets, brush heaps, downed logs, or rock piles for cover.
This carnivorous lizard feeds primarily on small invertebrates (slugs, spiders, centipedes, scorpions, beetles, grasshoppers, and crickets), but also is known to feed on bird eggs, nestlings, other lizards, and small mammals.