Marbled Murrelet vs Pigeon Guillemot

The Marbled Murrelet and Pigeon Guillemot are both small seabirds found along the Pacific coast, but they differ in nesting habits and plumage. The Marbled Murrelet is known for its unique tree-nesting behavior, while the Pigeon Guillemot nests in rocky crevices. In the field, plumage and behavior are key to distinguishing them.

Look for the white wing patches on the Pigeon Guillemot, especially in flight. Observe nesting behavior: Marbled Murrelets nest in trees, while Pigeon Guillemots nest in rocky crevices. Listen for calls: Marbled Murrelets have a high-pitched, rapid call, whereas Pigeon Guillemots produce a high-pitched whistle. Note habitat preferences: Marbled Murrelets are associated with old-growth forests, while Pigeon Guillemots are found along rocky coastlines.

Both species are similar in size, but the Pigeon Guillemot is slightly larger and more robust than the Marbled Murrelet.

In breeding plumage, the Marbled Murrelet has a mottled brown appearance, while the Pigeon Guillemot is mostly black with distinctive white wing patches. In non-breeding plumage, the Marbled Murrelet becomes more grayish with a white throat, whereas the Pigeon Guillemot retains its white wing patches.

Marbled Murrelets are more secretive and often seen alone or in pairs, while Pigeon Guillemots are more social and can be seen in small groups. The Pigeon Guillemot frequently dives nearshore and is often seen perched on rocks.

Marbled Murrelets are typically found in coastal waters near old-growth forests where they nest, whereas Pigeon Guillemots prefer rocky coastlines and are often seen near cliffs or islands.

The Marbled Murrelet has a high-pitched, rapid call, while the Pigeon Guillemot's call is a high-pitched whistle. These vocalizations can be helpful in distinguishing the two species.