Black Oystercatcher

The Black Oystercatcher is a large, uniformly dark shorebird restricted to rocky Pacific coastlines and offshore islands of North America, from Alaska south to Baja California. Unlike most other oystercatchers, which show a bold black-and-white pied pattern, this species is entirely sooty black to blackish-brown from head to tail, with no contrasting white areas in its plumage at all.

Its long, bright orange-red bill and pink legs stand out vividly against the dark plumage in life, though these soft-tissue colors are not present on shed feathers. It is closely tied to rocky intertidal habitat, rarely straying onto sandy beaches favored by some related species.

An entirely dark, sooty black-brown feather lacking any white markings, found along a rocky Pacific coastline of North America, is a strong indicator of this species given the absence of similarly all-dark oystercatchers elsewhere in the region.

Shape and Size

Flight feathers are broad and strong, and body feathers are dense, consistent with a large-bodied rocky-shore forager.

Color and Pattern

• Plumage is uniformly sooty black to blackish-brown throughout the body, wings, and tail.
• There is no white wing bar and no white underparts, unlike the pied pattern of the American and Eurasian Oystercatchers.
• Subtle brownish tones may be more apparent on the back and wing coverts than on the head, but overall contrast is minimal.

Shaft and Vane

Shafts are dark throughout, consistent with the species' uniformly dark plumage, without the sharp black-to-white transitions seen in pied relatives.

Distinguishing from Similar Species

The complete absence of white in the plumage immediately separates this species from both the American Oystercatcher, which shows white underparts and a wing bar, and the Eurasian Oystercatcher, which is even more boldly pied; within its Pacific range, no other oystercatcher shares this entirely dark plumage.

Adults are uniformly sooty black to blackish-brown throughout, with a long orange-red bill, pale yellow eyes with an orange eye-ring, and pink legs in life. Sexes look alike. Juveniles are similarly dark but with a duller, dark-tipped bill and slightly browner overall tone, developing the full adult bill color over time. Molt follows breeding, with a complete post-breeding molt refreshing the dark plumage.

The Black Oystercatcher is restricted to rocky Pacific coastlines and offshore islands of North America, from the Aleutian Islands and southern Alaska south through British Columbia and the U.S. Pacific coast to Baja California. It is closely tied to rocky intertidal habitat and is largely resident, with only limited local movement outside the breeding season.

This species forages among rocks and in the intertidal zone, taking mussels, limpets, and other shellfish, prying them from rock surfaces or shells open with its stout bill. It is usually found in pairs or small family groups, strongly tied to rocky shoreline territories year-round. Its call is a loud, piercing piping note similar to other oystercatchers. Nests are shallow scrapes on rocky shorelines or small offshore islands, often placed just above the high-tide line. For feather finders, an entirely dark sooty black-brown feather lacking any white markings, found along a rocky Pacific coastline of North America, is a strong indicator of this species.