Ruff
Calidris pugnax
The ruff has a distinctive pot-bellied appearance, with a small head, medium-length bill, longish neck and heavy body. It has long legs that are variable in colour, being dark greenish in juveniles, pink to orange in adults with some males having reddish orange legs only during the breeding season. In flight, it has a deeper, slower wing stroke than other waders of a similar size, and displays a thin, indistinct white bar on the wing, and white ovals on the sides of the tail. The species shows sexual dimorphism.
ID text from Wikipedia, CC BY-SA 4.0
Semipalmated Sandpiper
Calidris pusilla
It is a small sandpiper, 15–18 centimetres (6–7 inches) long and weighing around 18–51.5 grams (0.63–1.82 ounces). Wingspan ranges from 13.8 to 14.6 in (35 to 37 cm). Adults have black legs and a short, stout, straight dark bill. The body is dark grey-brown on top and white underneath. The head and neck are tinged light grey-brown. This bird can be difficult to distinguish from other similar tiny shorebirds, in particular the western sandpiper; these are known collectively as "peeps" or "stints". Jonsson, Lars & Peter J.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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