Search results
Results From The WOW.Com Content Network
It was carved by the Swan River, likely before the Tertiary, when this part of the continental shelf was above sea level. It is an average of 1.5 kilometres (5,000 ft) deep and 15 kilometres (9.3 mi) across, making it similar in dimension to the Grand Canyon. [1]
The mute swan (Cygnus olor) is a species of swan and a member of the waterfowl family Anatidae. It is native to much of Eurasia , and (as a rare winter visitor) the far north of Africa. It is an introduced species in North America, home to the largest populations outside of its native range, with additional smaller introductions in Australasia ...
The trumpeter swan (Cygnus buccinator) is a species of swan found in North America.The heaviest living bird native to North America, it is also the largest extant species of waterfowl, with a wingspan of 185 to 304.8 cm (6 ft 2 in to 10 ft 2 in).
The black swan's preferred habitat extends across fresh, brackish and salt water lakes, swamps and rivers with underwater and emergent vegetation for food and nesting materials. It also favors permanent wetlands , including ornamental lakes, but can also be found in flooded pastures and tidal mudflats, and occasionally on the open sea near ...
Extant species range in size from the cotton pygmy goose, at as little as 26.5 cm (10.5 in) and 164 g (5.8 oz), to the trumpeter swan, at as much as 183 cm (6 ft) and 17.2 kg (38 lb). The largest anatid ever known is the extinct flightless Garganornis ballmanni at 22 kg (49 lb).
The tundra swan (Cygnus columbianus) is a small swan of the Holarctic. The two taxa within it are usually regarded as conspecific , but are also sometimes [ 3 ] [ 4 ] split into two species : Bewick's swan ( Cygnus bewickii ) of the Palaearctic and the whistling swan ( C. columbianus ) proper of the Nearctic .
Annakacygna is a genus of flightless marine swan from the Miocene of Japan.Named in 2022, Annakacygna displays a series of unique adaptations setting it apart from any other known swan, including a filter feeding lifestyle, a highly mobile tail and wings that likely formed a cradle for their hatchlings in a fashion similar to modern mute swans.
Bewick's swan, Cygnus (columbianus) bewickii is the Eurasian form that migrates from Arctic Russia to western Europe and eastern Asia (China, Korea, Japan) in winter. Whistling swan, Cygnus (columbianus) columbianus is the North American form. North America, Eurasia