These Type D killer whales have blunter heads and a different color pattern than other orcas. A new species designation hinges on the results of genetic testing.

Five newly identified species of snakes suck the mollusks right out of their shells.  

The studded cells belong to a newly discovered species of water bear, Macrobiotus shonaicus. 

A once critically endangered species of leaf frog has made a comeback. 

A sampling of some of the fascinating critters identified by scientists this year

Taking into account the interaction of nuclear and mitochondrial genes in birds holds the promise of more objectively defining what constitutes a species.

A look at State University of New York College of Environmental Science and Forestry scientists’ picks

The olinguito, misidentified by zookeepers and museum curators for nearly a century, is the first new carnivorous mammal discovered in the Western Hemisphere in 35 years.

The International Institute for Species Exploration at Arizona State University reveals its list of the top 10 new species of 2012.