Common Murre (also known as the Thin-billed Murre or Common Guillemot)

The Common Murre is a large auk with a dark brown-black head, back, and wings, contrasted by clean white underparts. Known for their upright, penguin-like stance on breeding ledges, they are exceptional diving seabirds capable of propelling themselves deep underwater using their wings.

Rich dark charcoal-black or deep slate-gray tip blending smoothly through a lighter gray mid-section into a stark white, fluffy base. Melanin-based coloration provides structural durability.

Pennaceous upper vane with tightly interlocked barbicels transitioning into a fluffy, plumulaceous downy base with an afterfeather structure.

Central rachis is robust yet flexible, dark at the tip and fading to white at the base. Barbs are tightly packed and angled neatly to form a smooth, waterproof surface.

Smooth, slightly glossy, and tightly knit pennaceous tip designed for waterproofing, contrasting with the soft, downy base near the calamus.

Upperparts, mantle, or back contour feather, determined by the dense waterproof structure and distinct dark-to-light gradient typical of upper body plumage.

Distinctive monochromatic gradient from dark slate-black at the rounded tip to a fluffy white base, paired with dense, waterproof barbules typical of diving alcids.

Marine pelagic environments, rocky coastal cliffs, islands, and cold northern oceanic waters during the non-breeding season.

Circumpolar distribution across subarctic and boreal waters of the North Atlantic and North Pacific oceans, migrating south in winter.

Vital marine apex predator and bioindicator species in cold-water marine ecosystems, feeding primarily on small schooling fish and invertebrates.

Thick-billed Murre (Uria lomvia) and Razorbill (Alca torda), which share similar dark upperparts but differ slightly in bill structure and exact mantle feather tones.

Common Murres lay single, highly pointed pyriform eggs directly on narrow rock ledges; the pear shape prevents the egg from rolling off the cliff in the wind.

Historically harvested for eggs and meat by coastal human populations. Murre feathers and down have occasionally been used locally, though heavily regulated today.

Look near rocky seabird breeding colonies, sea cliffs, or along northern coastlines, especially following winter storms or during the post-breeding molt period.

Good condition with intact barbs and a clean pennaceous vane, showing minimal wear or fraying.