Ruff

The Ruff, Calidris pugnax, is a medium-sized wading bird known for its remarkable breeding plumage and sexual dimorphism. Males, significantly larger than females, boast ornate ruffs and head tufts in a variety of colors during the breeding season. Females, referred to as "reeves," are more subdued in coloration. The species exhibits a pot-bellied profile, with a small head and long neck, and displays a distinctive flight pattern with a slow wingbeat.

Identification Tips

In breeding plumage, males are unmistakable with their bright ruffs and head tufts, which can be black, chestnut, or white. Females and non-breeding males are more cryptic, with grey-brown upperparts and mainly white underparts. Juveniles resemble non-breeding adults but have a buff tinge to their plumage. The ruff's long legs vary in color from greenish in juveniles to pink or orange in adults.

Habitat

Ruffs breed in marshes and wet meadows across northern Eurasia. They prefer hummocky marshes and deltas with shallow water for feeding and dry areas with sedge or low scrub for nesting.

Distribution

This migratory species breeds from Scandinavia and Great Britain to the Pacific, with the largest numbers in Russia and Scandinavia. In winter, they are found in southern and western Europe, Africa, southern Asia, and parts of Australia.

Behaviour

Ruffs are highly gregarious, especially during migration when they form large flocks. Males display at leks, with territorial males occupying small areas and satellite males attempting to mate within these territories. A third, rare male type mimics females to gain mating opportunities.

Song & Calls

The ruff is generally silent, but during display, a soft "gue-gue-gue" may be heard.

Breeding

Females lay four eggs in a well-hidden ground nest and incubate them alone. Chicks are mobile soon after hatching and are reared solely by the female. Males leave the breeding grounds early in the season.

Similar Species

Juvenile sharp-tailed sandpipers and buff-breasted sandpipers can be confused with juvenile ruffs but differ in size, shape, and plumage details.

Diet and Feeding

Ruffs feed on insects, especially during the breeding season, and consume plant material, including rice and maize, during migration and winter. They forage in wet grassland and soft mud, probing or searching by sight for edible items.

Conservation status

Globally, the ruff is classified as "Least Concern" due to its large breeding numbers in Scandinavia and the Arctic. However, European populations are contracting and are listed as "Near Threatened" due to habitat loss and over-hunting. The species is protected under the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA).