The ferocious creatures displaced the native harvester ants we usually call red ants, which make up as much as 70 to 90 percent of a mature horned toad's diet - as many as 200 ants a day, Ferran said.

Texas horned lizards, or horny toads, raised at the Fort Worth Zoo have reproduced hatchlings in the wild. The threatened species is the state reptile. Photo from Kerr & Mason Mountain Wildlife ...