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A sea otter in Morro Bay, Calif. About three quarters of all species are land dwellers, while a quarter live in the oceans, according to a study published in the journal PLoS Biology.

In the most precise guestimate in history, scientists have narrowed down the number of species in the world to 8.7 million — give or take 1.3 million. Read more»

A whale shark off the coast of the Yucatan Peninsula in July 2010.

Hundreds of whale sharks, the largest fish in the world, have met up for their annual summer congregation in the Gulf of Mexico. Read more»