The Common Guillemot, called just the Guillemot in the UK
and the Common or Thin-billed Murre in North America, is
an auk native to sub-Arctic and northern temperate oceans.
They spend most of their lives at sea, comming ashore only
to breed. They nest in dense colonies on steep cliffs to
reduce the risk of predation of eggs and young.
They are most at home in the water, diving for fish. Some
subspecies have dark chocolate brown plumage and some have
black, both with white fronts. Juveniles have white cheeks
and chins. A "bridled" form has white eye rings and a white
streak from the eye looking like a pair of spectacles.
Auks fill the "penguin" niche in the northern oceans.
However they have
wings rather than flippers and can (and do) fly.