The area is home to huge colonies of gannets, puffins, skuas and other seabirds. Depending on the season, birds may include fulmars, guillemots, kittiwakes, puffins and razorbills. Avifauna species number 200, including auks, tufted puffins and swans. Shags, herring gulls, and puffins are also present. The island once had large numbers of puffins and guillemots. The alcid family includes the murres, guillemots, auklets, puffins, and murrelets. Penguins, loons, and puffins are without pneumatized bones entirely. The island has many puffins and some storm petrels. The family Alcidae includes auks, murres, and puffins. It also readily kills and eats smaller birds such as puffins. Breeding colonies of Atlantic puffins provide an interesting spectacle for both bird watchers and tourists. Synchronous laying of eggs is found in Atlantic puffins in adjacent burrows. Seals have been known to kill puffins and large fish may also do so. The burrow is similar to those made by hyenas and puffins today. The total number of horned puffins is estimated at 1,200,000.