Red-necked Phalarope

The red-necked phalarope is a small wader measuring about 17–20cm long, with a wingspan near 38cm and a weight around 35g. Lobed toes suit its strongly aquatic habits, while the bill is straight and fine. Breeding females are chiefly dark grey above, with a chestnut neck and upper breast, black face and white throat; males are duller. In winter both sexes become grey above and white below, retaining a conspicuous black eye-patch. (Wikipedia, red-necked phalarope account)

This phalarope breeds in Arctic North America and Eurasia, then spends almost all the nonbreeding season on tropical oceans. It often feeds by swimming rapidly in a tight circle, creating a small vortex that lifts insects and crustaceans within reach. Females pursue males and may lay multiple clutches, whereas males incubate and rear the chicks. A grass-lined scrape usually holds four eggs; incubation lasts about twenty days, and the precocial young can fly within roughly another twenty days. (Wikipedia, red-necked phalarope account)