Andarríos solitario

Identification

The solitary sandpiper is a small, dumpy wader measuring 18–23 cm long with a wingspan up to 50 cm and weighing just 31–65 grams. Look for its distinctive dark green back contrasting with a greyish head and breast, while the underparts are otherwise white. In flight, the species reveals its most diagnostic features: dark wings both above and below, combined with a dark rump and tail centre—a crucial distinction from its close European relative, the green sandpiper, which displays a brilliant white rump. The solitary sandpiper's wings are brown with delicate light spotting, and it shows a striking, contrasting neck and chest pattern. One of the easiest ways to identify this species in the field is by its characteristic three-note whistle given in flight.

Range & Habitat

This migratory species breeds across woodlands in Alaska and Canada, with two subspecies dividing the breeding range: T. s. cinnamomea in Alaska and western Canada, and T. s. solitaria from eastern British Columbia to Labrador. After breeding, solitary sandpipers migrate to winter in Central and South America, with significant populations in the Amazon River basin and the Caribbean. The species is a very rare vagrant to western Europe during summer and fall.

Unlike most other sandpipers, the solitary sandpiper is strongly associated with freshwater habitats. It favours small, confined spaces such as ditches and pond margins where other waders would feel exposed and vulnerable, preferring sites where a clear all-round view is unnecessary.

Behaviour & Diet

True to its name, the solitary sandpiper is not a gregarious species and is typically encountered alone during migration, though small numbers occasionally gather in particularly productive feeding areas. This species has an unusual breeding habit for sandpipers: it lays clutches of 3–5 eggs in abandoned tree nests of songbirds, particularly those built by thrushes. Young birds are encouraged to leave the nest and drop to the ground soon after hatching.

When feeding, solitary sandpipers methodically work the edges of ponds and shallow water, picking small invertebrates from the mud. Their diet consists primarily of insect larvae and adults, including mosquito larvae, young midges, grasshoppers, caterpillars, and beetles, supplemented by small crustaceans and molluscs such as snails. They occasionally take small frogs, predominantly in tadpole form.

Best Time & Places to See It

Solitary sandpipers are best observed during migration periods. Search for them around freshwater habitats including small ponds, ditches, marshes, and sheltered water margins where they feed quietly and inconspicuously. In North America, look for them during spring and fall migration in suitable woodland and wetland areas. Their preference for small, confined freshwater sites means they can be found in places where larger wader species would rarely venture.

Photography Tips

Patience is essential when photographing solitary sandpipers, as they are often solitary and may be skittish. Position yourself quietly near small ponds or marshy areas and wait for the bird to work along the water's edge. The species' dark plumage can be challenging to expose correctly; ensure adequate light on the underparts to capture the contrasting white belly. In flight, the dark rump and tail centre are diagnostic features worth attempting to capture, along with the dark wing undersides. Early morning or late afternoon light can beautifully illuminate the bird's subtle green tones on the back.