An Atlantic puffin (Fratercula arctica) guards the entrance to its burrow while its mate tends to their nest in the Látrabjarg bird cliff in Iceland. Puffins nest in burrow at the top of the bird cliff, up to 440 meters (1444 feet) above the Atlantic Ocean. Látrabjarg, Europe's largest bird cliff, hosts up to 40 percent of the breeding populations of some species.
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