ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Green turtle (Chelonia mydas) taking a breath of air at the water's surface. The green turtle breathes air like every other reptile, taking a breath every 30 minutes or so during normal activity. When sleeping it can remain submerged for several hours. Adults are almost exclusively herbivorous, feeding on seagrass and algae. Females crawl up on beaches to lay their eggs in the sand, but males spend their entire lives at sea, apart from the brief sprint down to the water immediately after hatching. The green turtle can reach a length of over a metre. Photographed in the Indian Ocean north of Madagascar.
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