Puffins and guillemots
Photos of Puffin skeleton, Guillemot skeleton, and Thick-billed Murre (also known as Brünnich's guillemot or Pallas' murre) skeleton..
Mormon fratercula, Uria aalge and Uria lomvia skeletons.
Closely related to waders and waterbirds, these are primarily of the auk family.
Courtesy of the University Museum of Zoology, Cambridge