glass frogs seem to vanish in plain sight—the transparent skin of their undersides erasing the hard edges of their silhouette, making them difficult for birds and other predators to spot.

Their delicate, greenish transparent forms don't cast shadows, rendering them almost invisible to birds and other predators passing overhead or underneath. But when northern glass frogs wake up ...

These animals transparency serves as a survival mechanism, helping them blend into their environment and avoid predators. The ...