Two pairs of Atlantic puffins (Fratercula arctica) rub their bills together, a display known as billing, to select a mate at the top of the Látrabjarg bird cliff in western Iceland. Látrabjarg is Europe's largest bird cliff: 14 km (8.7 miles) long and up to 440 meters (1444 feet) high. It hosts up to 40 percent of the breeding populations of some species.
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