He thought it was a prank, but was stunned to find it was a tree-frog that had arrived with roses from Colombia via Ecuador. Frogs, lizards and insects pests are the main stowaways detected in the UK.

According to one app for nature observers, it's the most commonly seen creature in California: the western fence lizard. Why?

It seems likely that Marmoretta and its relatives moved into the trees to avoid potential predators on the ground. This might be one reason that lizards are still thriving more than 160 million ...

Under the shade of these oak trees, the dunes sagebrush lizard buries itself in the cool, white sand, avoiding predators and regulating its body temperature. But when it comes to oil and gas ...