Chameleons have it easy. If they need to hide from a predator they just change their appearance, and disappear against whatever they happen to be standing on surrounded by leaves? Turn green. Tree trunk? Brown it is. But Aegean wall lizards have a different strategy. They live on the Greek Islands. And instead of changing their appearance, they find a safer spot. That is, they're really good at picking out just the right background to minimize the chances that they'll be spotted by a hungry crow or raptor. That's according to a new study in the journal Scientific Reports. Birds can perceive both visible and ultraviolet light, so researchers snapped regular and UV photos of lizards basking on rocks to figure out how the lizards look to birds. The scientists discovered that the lizards' camouflage is precisely tuned to avian eyeballs, helping them seem to disappear. Lizards with darker backs hang out on darker rocks.