Rock Sandpiper vs White-rumped Sandpiper

In short

The white rump patch is the most reliable field mark to distinguish the White-rumped Sandpiper from the Rock Sandpiper. The Rock Sandpiper is generally found in coastal habitats, while the White-rumped Sandpiper is a long-distance migrant with a more varied range.

Identification tips

1. Look for the white rump patch on the White-rumped Sandpiper, especially in flight. 2. Observe habitat: Rock Sandpipers are more coastal, while White-rumped Sandpipers are seen in varied habitats during migration. 3. Note behavior: White-rumped Sandpipers often migrate in small flocks. 4. Listen for calls during migration for the White-rumped Sandpiper.

Size

Both species are similar in size, but the White-rumped Sandpiper may appear slightly more slender.

Plumage

The Rock Sandpiper has a more uniform grayish-brown plumage in nonbreeding season, while the White-rumped Sandpiper features a distinctive white rump patch visible in flight. Both species have similar brownish tones but differ in specific markings.

Behaviour

Rock Sandpipers are often seen in coastal intertidal zones, feeding on invertebrates, while White-rumped Sandpipers are more migratory, often seen in small groups during migration.

Habitat

Rock Sandpipers are typically found in intertidal areas with soft substrates in Alaska, while White-rumped Sandpipers breed in arctic tundra and migrate through a variety of habitats, including wetlands and coastal areas.

Voice

The White-rumped Sandpiper has a distinct call often heard during migration, while Rock Sandpiper vocalizations are less frequently noted in field guides.