White-rumped Sandpiper vs Semipalmated Sandpiper

In short

The White-rumped Sandpiper is distinguished by its prominent white rump patch, a feature not present in the Semipalmated Sandpiper. Both species are small, migratory shorebirds often found together, but they differ in bill structure and primary projection.

Identification tips

• Look for the white rump patch on the White-rumped Sandpiper, especially in flight.
• Note the bill shape: the Semipalmated Sandpiper has a shorter, straighter bill compared to the slightly longer, more decurved bill of the White-rumped Sandpiper.
• Observe the primary projection: the White-rumped Sandpiper has longer primary projection beyond the tail.
• Listen for the distinct call of the White-rumped Sandpiper as an auditory clue.

Size

Both species are similar in size, but the White-rumped Sandpiper tends to be slightly larger.

Plumage

The White-rumped Sandpiper has a distinctive white rump patch, while the Semipalmated Sandpiper lacks this feature. Both have similar overall plumage tones, but the White-rumped Sandpiper may appear slightly grayer.

Behaviour

Both species forage in flocks, but the White-rumped Sandpiper may defend feeding territories more aggressively.

Habitat

Both species share similar migratory habitats, often seen in coastal and wetland areas. However, the White-rumped Sandpiper breeds in arctic tundra, while the Semipalmated Sandpiper breeds in subarctic and boreal regions.

Voice

The White-rumped Sandpiper has a distinct call, often described as a sharp 'tzeet', which can help differentiate it from the Semipalmated Sandpiper.