Spotted a lizard doing push ups? Here's why they do it and why they don't get tired of doing it.

Lizards' push-up movements are actually a form of communication. Both male and female lizards can perform push-up displays.

Southern California’s alligator lizards eat the arachnids with abandon, and seem to have evolved immunity to their toxins. The western black widow spider (Latrodectus hesperus) may spin a disorderly ...