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Murres are members of the auk family and in North America there are two species of this seabird. The Common Murre and the sub-specie, the Bridled Common Murre, are regarded as the same specie. These two birds are distinguished apart by a white ring around the eyes, which continues to the back of the head of the Bridled Common Murre whereas the Common Murre has no white marking on its face.
The Thick-billed Murre is the second type. This bird is of a similar size to the Common Murre with the same black and white colouring. It is identified by its larger bill and a white line starting from the corner of its bill to under its eyes. Also, the Thick-billed Murre has a larger head and not as straight of an upright profile as the Common Murre when they are seen standing.
Murres form huge colonies that number in the high thousands. These large numbers can be seen in their nesting areas. The mature murres will gather by the thousands on cliff walls and their juveniles gather in rafts of thousands in the waters below.