The Texas Horned Lizard eats mainly Harvester ants, Pogonomyrmex spp., but will also eat grasshoppers, isopods, beetles and beetle larvae. In order to obtain enough energy, adult Texas Horned Lizards must forage from several colonies of Harvester ants. The Texas Horned Lizards' daily activities are planned around the times of highest ant activity. (Donaldson, et al 1994)
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