Deep below the surface of a river in northern Brazil, a “shy” creature tucked its “armored” body into a rocky crevice. Divers ...

A tiny, scaleless, freshwater fish, the highly endangered unarmored threespine stickleback is a fierce protector of its nest, which it defends by dashing forward with gaping mouth and “hackles” raised ...

In a river of northeastern Brazil, an “armored” creature with “large” eyes paused to rest against a rock. The maze-like pattern that helped camouflage it in the wild also made it a popular aquarium ...