Guillemots, also known as murres, are diving seabirds that belong to the auk family. They are often found in large numbers on rocky offshore islands, cliffs, and shores. Some synonyms for guillemots include the common murre, thick-billed murre, razorbill, and little auk. The common murre is the most widespread member of the guillemot family, found in the North Atlantic and North Pacific oceans. The thick-billed murre, as the name suggests, has a thicker bill and is found in the Arctic. The razorbill has a distinctive black and white coloration and is found in the North Atlantic. The little auk is the smallest of the guillemot family and is found in the Arctic.