Photo: Phil Brown/Flickr Creative Commons

Thick-billed Murre

Uria lomvia

A large, robust auk, swimming and diving deep in cold ocean waters. Very similar to Common Murre. The two are found together in many areas, even nesting on the same ledges of rocky northern islands, but the Thick-billed has its center of abundance farther north. Despite major recent declines, its population in the eastern Canadian Arctic undoubtedly runs into the millions.
Conservation status Population still in the millions, but reported declines of 20%-50% in some large colonies in recent decades are cause for concern. Eggs and adults harvested for food by natives in some Arctic areas. Bigger threats to survival are large numbers killed in fishing nets, and vulnerability to pollution, oil spills, and effects of climate change.
Family Auks, Murres, Puffins
Habitat Ocean, nesting colonially on ledges of sea cliffs. Favors very cold ocean waters of Arctic; when not nesting, often very far from land over deep waters. May associate with edges or openings in pack ice. Nests on rocky coasts or islands with steep cliffs.
A large, robust auk, swimming and diving deep in cold ocean waters. Very similar to Common Murre. The two are found together in many areas, even nesting on the same ledges of rocky northern islands, but the Thick-billed has its center of abundance farther north. Despite major recent declines, its population in the eastern Canadian Arctic undoubtedly runs into the millions.
Photo Gallery
  • adult, nonbreeding
  • adults, breeding
  • adults, breeding
Feeding Behavior

Forages while swimming underwater. May dive to more than 200' below surface.


Eggs

One. Very variable, usually whitish, tan, blue, or green, with markings of brown and black. Incubation is by both sexes, 30-35 days. One parent is almost always at nest throughout nesting cycle. Young: Fed by both parents. Adults often forage many miles away from colony. Young leaves nest at 15-30 days, before able to fly; glides down to sea, accompanied by adult male. Young evidently is accompanied and cared for by male for several weeks after leaving nest.


Young

Fed by both parents. Adults often forage many miles away from colony. Young leaves nest at 15-30 days, before able to fly; glides down to sea, accompanied by adult male. Young evidently is accompanied and cared for by male for several weeks after leaving nest.

Diet

Mostly fish. Diet is primarily fish in summer (and young are fed almost entirely on fish); may include more crustaceans in winter. Fish in diet include cod, herring, capelin, sand lance, sculpin, many others. Crustaceans eaten include shrimp, amphipods, mysids, copepods. Also eats some marine worms, squid.


Nesting

Probably older than 3 years at first breeding. Nests in colonies, some very large. Some pair formation may occur before arrival at colony. At nest site, members of pair bow, nibble at each other's bills; may pick up pebbles and present them to each other. Nest site is on cliff ledge; may use narrower and smaller ledges than Common Murre. No nest, egg laid on bare rock.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Some remain through winter as far north as open water allows, including around openings in pack ice. Others move south. Regular in winter on waters off New England, has strayed farther south. In west, very rare south of Alaska in winter.

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Migration

Some remain through winter as far north as open water allows, including around openings in pack ice. Others move south. Regular in winter on waters off New England, has strayed farther south. In west, very rare south of Alaska in winter.

  • All Seasons - Common
  • All Seasons - Uncommon
  • Breeding - Common
  • Breeding - Uncommon
  • Winter - Common
  • Winter - Uncommon
  • Migration - Common
  • Migration - Uncommon
Songs and Calls
Similar to Common Murre: low, purring murrrr; also croaks and growls on breeding grounds.
Audio © Lang Elliott, Bob McGuire, Kevin Colver, Martyn Stewart and others.
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How climate change could affect this bird's range

In the broadest and most detailed study of its kind, Audubon scientists have used hundreds of thousands of citizen-science observations and sophisticated climate models to predict how birds in the U.S. and Canada will react to climate change.

Learn more

Read more: climate.audubon.org
Auks, Murres, Puffins Upright-perching Water Birds

Thick-billed Murre

The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season.

More on reading these maps.

Each map is a visual guide to where a particular bird species may find the climate conditions it needs to survive in the future. We call this the bird’s “climatic range.”

The colors indicate the season in which the bird may find suitable conditions— blue for winter, yellow for summer (breeding), and green for where they overlap (indicating their presence year-round).

The darker the shaded area, the more likely it is the bird species will find suitable climate conditions to survive there.

The outline of the approximate current range for each season remains fixed in each frame, allowing you to compare how the range will expand, contract, or shift in the future.

The first frame of the animation shows where the bird can find a suitable climate today (based on data from 2000). The next three frames predict where this bird’s suitable climate may shift in the future—one frame each for 2020, 2050, and 2080.

You can play or pause the animation with the orange button in the lower left, or select an individual frame to study by clicking on its year.

The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
Winter
Summer

Winter Range
Summer Range
Both Seasons
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