Lesser yellowlegs

Voice

A soft, flat, two-syllable tu-tu, sometimes reduced to a single note, without the ringing edge of Greater Yellowlegs. The tone is dull and slightly plaintive and carries far less. Two notes against three is the quickest separation of the two in the field, and it is more reliable than judging size on a lone bird.

Identification

At 23–25 cm it sits between Wood Sandpiper and Redshank, but stands far higher and looks greyer. The bill is fine, dead straight, uniformly dark and about the length of the head. The legs are bright yellow to orange-yellow, with a long bare tibia that shows well as the bird wades. Upperparts grey-brown with small white spots; head and neck finely streaked, the breast faintly streaked and fading into white with no sharp cut-off. In flight: a square white rump, a finely barred tail, plain wings without a bar, and toes projecting clearly beyond the tail.

Confusion species

Greater Yellowlegs is the main test — obviously bigger, with a bill about one and a half times head length, thicker and often grey at the base and faintly upturned, and a three-note call. Lesser has a needle-fine, dead straight, uniformly dark bill of head length and calls in twos. Marsh Sandpiper is the second candidate: olive to yellow-green legs rather than canary yellow, an even finer bill on a small round head, and in flight a long white wedge running up the back with an almost unbarred white tail, where Lesser shows a square white rump and a clearly barred tail. Juvenile Redshank also has yellowish legs, but is dumpier, has an orange bill base and shows a broad white trailing edge to the wing.

Habitat

Shallow fresh and slightly brackish water with a bare muddy edge: shallow-flooded grassland, clay pits, coastal borrow pits, sewage lagoons, sludge beds and newly created wetland. It walks faster and more restlessly than a Redshank, picks from the surface and seldom wades deep. On the breeding grounds it favours burnt clearings and open muskeg in the boreal forest of Canada and Alaska, with small ponds scattered among them.

Range and movements

Breeds across the North American taiga from Alaska to Quebec and winters from the Gulf coast to Argentina. In Europe it is the most numerous Nearctic shank: annual in Britain and Ireland, with a few tens of records for the Netherlands and most birds falling between July and October. Individuals often linger for weeks, and there are winter records.

Where and when to look

In August and September scan the shallow floods and pit margins where Ruff and Wood Sandpipers gather; a Lesser Yellowlegs picks itself out by the yellow legs and the hurried, high-stepping gait. Watch the tail as it lifts: square white rump, finely barred tail. Record the call if you can, since a single note settles the identification.

Conservation status

Least Concern, but North American survey work indicates a heavy loss since the 1970s, of the order of more than half the population. The pressures named are the loss of shallow stopover wetlands, shooting on migration in the Caribbean and northern South America, and change across the boreal breeding range.