Birdwatching has conflicting effects on common murres. The skins of these birds are larger than those of murres and puffins. The family Alcidae includes auks, murres, and puffins. This family also includes murres and puffins. They caught puffins, Lunda Cirrhata, Fratercula Corniculata, Guillemots, and Cephus & Murres. Common murres breed in colonies at high densities. The head pattern is the best way to distinguish first-year birds from common murres. The alcid family includes the murres, guillemots, auklets, puffins, and murrelets. Common murres have fast direct flight but are not very agile. When common murres are feeding their young, they return with one fish at a time. Common murres have been shown to be sensitive to visitor numbers. Common murres are "single-prey loaders", this means that they carry one fish at time. Thick-billed murres are closely associated with sea-ice throughout the year. Common murres perform appeasement displays more often at high densities and more often than razorbills. Strong-swimming murres hunt faster schooling fish, whereas auklets take slower-moving krill.