Male crabs of a species named after actor David Hasselhoff grow bigger claws than females so they can fight each other for a ...

During the hikes, researchers found over 20 unfamiliar-looking frogs, the study said. They took a closer look at the animals ...

A stock image shows a medaka, with an inset image of sperm (inset). Males of this fish species can mate over 20 times in a single day but release less and less sperm with each... A stock image ...