Thick-billed Murre: Was Sie wissen sollten
Our Expert Says… "A wonderful adaptation, the single egg of the thick-billed murre is slightly pyramidal in shape. This stops it from rolling off the very narrow ledges they use for nesting. Once the chicks can get to the water, the male then takes over looking after the swimming but not yet fledged chick while the exhausted females head out to sea to fatten up again."
The thick-billed murre (which is also known as Brunnich’s guillemot) is a seabird in the auk family. They are now the largest member of the auk family after the great auk became extinct in the mid-1800s. They grow up to 50cm (20”) long with an 81cm (32”) wingspan and weigh up to 1.5kg (52oz).
Mature adults have a black head, neck, wings, and back, with white underparts, with a small black tail. As the name suggests, they can be differentiated from the common murre by their thicker and shorter bill with a thin white stripe at the gape.
They can be found in many the polar and sub-polar regions of the north where they spend their entire time at sea apart from the breeding season. The thick-billed murre needs to keep its feather’s well-preened and a good layer of insulating fat as the waters in which it lives rarely get above 7C (45F)!
When it comes time to mate, the thick-billed murre forms huge colonies, sometimes over a million strong. They pack more densely than any other bird species, with each pair taking up less than 1 square foot of space. They don’t build nests but lay their single egg on the bare rock of narrow ledges or cliff faces.
Brunnich’s guillemot has one of the least efficient flight models of any bird thanks to its very short wingspan compared to body size. It takes them so much effort to take off that both adults must help to feed the chick because the birds can only bring back one food item at a time. It’s for this reason that each pair can only raise a single chick per season. Despite this restriction, they have become one of the most common species of seabird, with a world population estimated at up to 20 million individuals.