Sharp-tailed Sandpiper
Calidris acuminata
A small-medium wader, the portly sandpiper has a pot belly, flat back and somewhat drawn-out rear end. It has a mottled chestnut-brown upper body with sharp-looking feathers with a dark centre, a chestnut cap on its head and a brown stripe through each eye. Its bill is dark grey to black and straight, and its legs are olive- to yellow-coloured. The underparts are white or paler in colour, with the mottling similar to that on the breast and sides of the belly. The plumage is more vivid during the breeding season and duller in its winter plumage.
ID text from Wikipedia, CC BY-SA 4.0
Upland Sandpiper
Bartramia longicauda
An adult is roughly 30 cm (12 in) long with a 66 cm (26 in) wingspan. The average weight is 170 g (6 oz). This odd bird has a small dove-like head on a long neck. It is heavily marbled black and brown on the back and wings. The neck is streaked with dark brown which continues down to the breast and on to the flanks. The belly and undertail coverts are white, and the tail is quite long for a sandpiper. The upland sandpiper also has a white eye-ring and long yellow legs. Voice: Upland sandpipers can be identified by a distinctive call, sometimes called a "wolf whistle", which features a long, ascending whistle followed by a second rising and/or falling call. These sounds are often made while the bird is landing or while flying high.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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