Scientists may have been dramatically undercounting the number of vertebrate species on Earth. A large analysis of more than 300 studies suggests that for every recognized species of fish, bird, ...

Reef fish in different oceans often develop similar color patterns because evolution explores the same set of biological possibilities.

Two females of the newly discovered species, Halichoeres sanchezi or the tailspot wrasse. The males are larger and have different coloration. Credit: Allison & Carlos ...

A new blind fish species, Gitchak nakana, discovered in Assam, features a unique skull structure and translucent appearance.