Regal horned lizard are among some of the species that are commonly effected by people picking up wildlife, bringing it home, etc. Photo courtesy of Arizona Game and Fish Department.

Caldwell Zoo has hatched more than 70 threatened horned lizards this year, ... Because the Texas horned lizard is threatened, it is illegal to touch, pick up or possess the species in Texas.

Lizards move their bodies up and down, or do "push-ups," to communicate. Whether they're claiming territory, attracting a mate or warning off rivals. Do lizards communicate with push-ups?