During display flights, the male rises to almost 20 m, dropping like in parachute; also fluttering in a horizontal line and then rises nearly 50 m before landing on the floor. The nest is built by the female, although initial cavity is constructed by the male. At the beginning of the breeding season, both parents troop material to the nest, but later this activity is carried out by the male alone. Female incubate the eggs but both parents feed the chicks. The survival of the fledglings is about 60.6%.
It reproduced from early June to July in the north of its distribution, and in late May in the South; 1 brood per year. The nest is a cup of grasses, stems, dry plant material and moss in the base, woven with fine grasses, hair and feathers, usually the eggs are in a cavity at the end of a small tunnel. Is placed in trees of willow (Salix) on the ground in open areas near the coast, in mud, streams, or mounds in tundra. Puts 2 - 7 eggs, usually 5-6, sub-elliptical, smooth and shiny, are variable in color from gray to buff, brown or reddish, finely dotted or spotted, measuring 19 x 14 mm. Incubation lasts 11 - 14 days. The chicks are born covered with broad, long, dark gray to brown down, the commissures of bill are red, mouth is yellow, remain in the nest between 11 - 15 days.