The colour of the Guillemot changes from geographic location, appearing chocolate brown in southern areas, and a black colour in more northern reaches of their distribution.


These birds are found throughout the northern hemisphere with very few exceptions, however most notably the southern parts of the north Atlantic ocean. They are primarily found on cliff faces and other coastal areas which provide sufficient protection from the elements.


The Guillemot feeds primarily on fish and crustaceans, however is known to feed on cephalopods such as squid.

Predators & Threats

A common threat to coastal birds is that of human interactions. Overfishing and entanglement in fishing nets are two of the most influential factors that can cause significant reductions in local populations of this species. Natural threats include stoats, raccoons, gulls and snakes.


  • Guillemots are the most common auk within the British Isle.
  • Groups of breeding Guillemots are called loomeries.
Common Name(s)Scientific Name
Guillemot, Common MurreUria aalge
 40-45 cm
 20 years

Best Time to Look

March – October

Where to find Guillemot