Guillemots are seabirds belonging to the family Alcidae, which also includes puffins and murres. They are known for their sleek bodies and pointed wings, making them excellent divers. Guillemots primarily inhabit coastal regions in the Northern Hemisphere, where they nest on steep cliffs and rocky shores. These birds are characterized by their striking black and white plumage, with some species displaying distinctive markings. Guillemots feed mainly on fish and marine invertebrates, diving underwater to catch their prey. They are social birds, often found in large colonies during the breeding season, which helps protect them from predators.