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

Koi have six types of color cells in their skin ... Koi are actually a type of carp, and today they're some of the most expensive pet fish in the world. But why? Koi were originally raised ...

This species, with its many varieties, is the most common betta fish found in aquariums and pet stores, but it has more than 70 relatives, including the endangered Betta miniopinna and Betta ...