National Geographic : 2010 Dec
A parent swan in the Kainuu region at the eastern edge of Finland shepherds its cygnets (top), which hatch in June. A couple (above) call at another bird that has invaded their territory. Nests, built of mud, moss, and grass, may be refurbished and reused in subsequent years. Born down-covered and open-eyed, the young bene t from the vigilant surveillance of both parents (top). Within a few days they venture from the nest to forage for aquatic plants and insects (above). ey join their parents for fall migration and stay with them their rst winter.