The spotted sandpiper is about 7 to 8 inches (17.8–20.3 cm) in length with a wingspan of 14.6-15.8 inches (37-40 cm).
It has a white line over its eyes and long yellowish or pinkish legs. During the breeding season, it is brown above and white below with dark brown spots on its chest and belly. Its bill is a bright orange with a black tip.
In the winter, the spotted sandpiper has a grayish-brown back and sides and a spotless white breast. Its bill is yellow with a black tip.
Male and female spotted sandpipers look alike, but the female is a little larger.
Unlike most species of birds, the female spotted sandpiper reaches the breeding range before the male and selects and defends a territory. She then tries to attract a male.
The female lays 4 eggs in a grass and moss-lined nest made in a depression in the ground. The female may mate with more than one male, and she may lay eggs for each of them.
The male incubates the eggs and cares for the chicks. The chicks hatch in 20-24 days. They are precocial and leave the nest shortly after birth, hopping around looking for food. They fledge (develop flight feathers) when they are 17-21 days old.
The spotted sandpiper has a lifespan of around 9 years.
Behavior
The spotted sandpiper is sometimes called the “teeter-tail” because of the way it bobs its rump up and down as it probes for food.