Puffins and guillemots

Photos of Puffin skeleton, Guillemot skeleton, and Thick-billed Murre (also known as  Brünnich's guillemot or Pallas' murre) skeleton..

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Mormon fratercula, Uria aalge and Uria lomvia skeletons.

Closely related to waders and waterbirds, these are primarily of the auk family.

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Courtesy of the University Museum of Zoology, Cambridge