Солтүстік Америкалық ағаш үйрек туралы мәліметтер

Species of bird
the Australian species

The wood duck or Carolina duck (Aix sponsa) is a species of perching duck found in North America. The drake wood duck is one of the most colorful North American waterfowls. This is about three quarters the length of an adult mallard. It shares its genus with the Asian mandarin duck (Aix galericulata). The male's call is a rising whistle, jeeeeee; the females utter a drawn out, rising squeal, do weep do weep, when flushed, and a sharp cr r ek, cr e ek for an alarm call. They usually nest in cavities in trees close to water, although they will take advantage of nesting boxes in wetland locations. Other species may compete with them for nesting cavities, such as birds of prey, as well as mammals such as grey squirrels, and these animals may also occupy nest boxes meant for wood ducks. Wood ducks may end up nesting up to a mile away from their water source as a result. Females line their nests with feathers and other soft materials, and the elevation provides some protection from predators such as raccoons, owls, and hawks. Females typically lay seven to fifteen eggs which incubate for an average of thirty days.

The birds are year round residents in parts of its southern range, but the northern populations migrate south for the winter. Given its native distribution, the species is also a potential natural vagrant to Western Europe and there have been records in areas such as Cornwall, Scotland and the Isles of Scilly, which some observers consider may relate to wild birds; however, given the wood duck's popularity in captivity, it would be extremely difficult to prove their provenance. There is a small feral population in Dublin.

The population of the wood duck was in serious decline in the late 19th century as a result of severe habitat loss and market hunting for both meat and plumage for the ladies' hat market in Europe. By the beginning of the 20th century, wood ducks had become rare, almost disappearing in many areas. In response to the Migratory Bird Treaty, established in 1916, and enactment of the U. S. Migratory Bird Treaty Act of 1918, wood ducks finally began to repopulate. By enforcing existing hunting regulations and protecting woodland and marsh habitat, wood duck populations began to rebound starting in the 1920s. The erection of nesting boxes starting in the 1930s further assisted wood duck conservation. Landowners as well as park and refuge managers can encourage wood ducks by building wood duck nest boxes near lakes, ponds, and streams. Fulda, Minnesota, has adopted the wood duck as an unofficial mascot, and a large number of nest boxes can be found in the area. Expanding North American beaver (Castor canadensis) populations throughout the wood duck's range have also helped the population rebound as beavers create an ideal forested wetland habitat for wood ducks.