安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Aythya - Wikipedia
The species are plump, compact, medium-sized ducks ranging from 37–61 cm long, 60–84 cm wingspan, and weighing 410–1600 g, with canvasback the largest, and ring-necked duck and ferruginous duck marginally the smallest
- Redhead (Aythya americana) | U. S. Fish Wildlife Service
Redheads are large diving ducks that feed by diving below the water’s surface looking for plant tubers and other foods This species often occurs in large flocks, called rafts, especially during winter months This duck is known for its rounded, bright red head, two tone bill and gray back
- Aythya duck sp. - eBird
Learn about Aythya duck sp : explore photos, sounds, and observations collected by birders around the world
- Aythya - Ask A Biologist
Almost always seen in pairs or small flocks on marshy lakes, golf ponds, reservoirs and occasionally coastal estuaries, this species dives for aquatic vegetation and invertebrates The nest is placed near the water on a dry area and is made of grass and moss
- Lesser Scaup vs Greater Scaup: Key Identification Field Marks
Distinguishing Lesser Scaup (Aythya affinis) vs Greater Scaup (Aythya marila) is one of the most persistent identification challenges faced by North American birders and waterfowl enthusiasts
- Redhead | Audubon Field Guide
In summer, when males abandon their mates, they may fly hundreds of miles to the north to lakes where they go through the flightless stage of molt Main migration is fairly late in fall and early in spring
- Aythya americana (redhead) | INFORMATION | Animal Diversity Web
The Aythya americana breeding range extends from southern Canada to the northern United States (Washington to Maine) Many breed in the Prairie Pothole region of the northern Great Plains of North America
- Redhead Overview, All About Birds, Cornell Lab of Ornithology
These sociable ducks molt, migrate, and winter in sometimes-huge flocks, particularly along the Gulf Coast, where winter numbers can reach the thousands Summers find them nesting in reedy ponds of the Great Plains and West Female and young Redheads are uniform brown, with the same black-tipped, blue-gray bill as the male
|
|
|