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two puffins dueling, Skomer Island, British Isles

May 15, 2014 | Huffing Puffins

Dueling puffins flare their wings and part their beaks in a muddy tussle on Skomer Island, Wales. Most puffin fights start over competing claims to a burrow. A bite to the neck usually settles the issue.

See more pictures from the June 2014 feature story “Puffin Therapy.”

Photograph by Danny Green, National Geographic