Some creatures blend in by sticking out. Learn more about glass frogs and the special way they hide their blood.

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.

Glass frogs may be tiny (1.2-3 inches long), but they are effective predators. ©YouTube/Science News There are many peculiar amphibians in the rainforest, but none expose themselves quite like ...