The broad-billed sandpiper (Calidris falcinellus) is a small wading bird. The scientific name is from Latin. The specific name falcinella is from falx, falcis, "a sickle. Some research suggests that it should rather go into the genus Philomachus.
Broad-billed sandpipers are small waders, slightly smaller than the dunlin, but with a longer straighter bill, and shorter legs. The breeding adult has patterned dark grey upperparts and white underparts with blackish markings on the breast. It has a pale crown stripe and supercilia.
In the boreal winter, they are pale grey above and white below, like a winter dunlin, but retaining the head pattern. Juveniles have backs, similar to young dunlin, but the white flanks and belly and brown-streaked breast are distinctive.
Contact call is a dry, whistling “dree-it, dree-it” and a clicking “dik dik”.