Panamanian golden frogs—such as F1, seen here—are native to the rainforests and cloud forests of Panama but haven't been seen in the wild since 2009. Each creature's bright coloration warns ...

In the rainforests of Suriname, a snake stalks a small bright-blue frog. The frog makes no attempt to hide and the predator makes no attempt to attack. The key to this bizarre standoff is color ...