While pursuing elusive fish species in each region, it's natural to ask: which of them is the rarest in the game? One may look at the Megalodon and its variants from the Ancient Isle to answer ...

In rare video footage, a male whale shark has been spotted biting at his female partner during courtship. Before now, we knew very little about the secret sex lives of the world's largest fish ...

The "rare desert fish" is a "small, moderately chubby fish that feasts on a variety of native food sources and has a unique and distinctly red coloration on the underside when in breeding ...

The Devils Hole pupfish is one of the rarest fish in the world, and the underwater cavern is its only natural habitat on the planet. U.S. Fish and Wildlife Service photo by Olin Feuerbacher It ...

DENVER (KDVR) — One of the world’s rarest equids was born at the Denver Zoo Conservation Alliance this week, marking a critical step for the future of the Critically Endangered species.

PHOENIX — A newly built segment of the southern Arizona border wall may bolster national security, but it will endanger one of the rarest desert fish in the U.S., according to the Center for ...