Curlew Sandpiper vs Dunlin

In short

Curlew Sandpiper and Dunlin are both small, migratory shorebirds, but they can be distinguished by their bill shape and plumage. The Curlew Sandpiper has a longer, more decurved bill compared to the Dunlin's shorter, slightly drooped bill. In breeding plumage, the Curlew Sandpiper shows a distinctive rufous coloration, while the Dunlin has a black belly patch.

Identification tips

1. Bill Shape: Look for the longer, more decurved bill of the Curlew Sandpiper. 2. Breeding Plumage: Note the rufous coloration of the Curlew Sandpiper versus the black belly patch of the Dunlin. 3. Non-breeding Plumage: Curlew Sandpipers are generally paler. 4. Flock Size: Dunlins are often in larger flocks. 5. Leg Length: Curlew Sandpipers have slightly longer legs.

Size

Both species are similar in size, but the Curlew Sandpiper is slightly more slender and has longer legs.

Plumage

In breeding plumage, the Curlew Sandpiper is rufous with a white belly, whereas the Dunlin has a distinctive black belly patch and a rufous back. In non-breeding plumage, both species are grayish, but the Curlew Sandpiper tends to be paler.

Behaviour

Both species forage by probing in mudflats, but the Curlew Sandpiper may be seen in smaller, more dispersed groups compared to the often large flocks of Dunlin.

Habitat

Both species frequent coastal mudflats and estuaries, but the Dunlin is more likely to be found in large flocks during winter in estuarine habitats.

Voice

Vocalizations are not a primary distinguishing feature in the field, as both species have similar calls.