Anas carolinensis

The male resembles the male green-winged teal but has a thick white vertical stripe on each side of the chest. The difference between the male green-winged teal and the male green-winged teal in the wild is that the yellow edge of the eye mask is lighter, thinner and less obvious than the latter, the chest is reddish, and the position of the white vertical stripe (sometimes creamy yellow) has moved from the shoulders of the latter to the sides of the chest. The female is gray-brown overall, with a lighter head and abdomen, and a green wing lens but slightly darker. It is extremely difficult to distinguish it from the female green-winged teal in the wild. The iris is dark brown, the bill is black brown, and the base of the female is sometimes stained yellow, and the feet are flesh-colored or dark.

In China, it only appears in Hebei, Guangdong and Hong Kong. Abroad, it is widely distributed in the North and Central America between the Arctic Circle and Honduras. In Asia, the stray bird is found in Japan, the Korean Peninsula, South Korea and Russia; in Europe, the stray bird is found in the UK and other places.

During the breeding season, it prefers lakes and ponds with dense aquatic plants. During the non-breeding season, it lives in pairs or groups in lakes, rivers, ponds, swamps and other waters. It likes to mix with other river ducks, flies quickly and flaps its wings quickly and powerfully.

The American Green-winged Duck (Anascaro linensis) was discovered by birdwatchers Philip Hyde and Paul Hyde at Dongtan, Nanhui, Shanghai, and is a new record for Shanghai birds.

The American Green-winged Duck inhabits shallow lakes, wetlands, ponds and winding rivers, feeding on aquatic invertebrates, larval amphibians, wetland plant seeds and pond weeds.

This bird species is naturally distributed in North America, breeding in northern North America and wintering in the south. There are some permanent resident populations in the eastern and western regions. It is rarely recorded in China and is considered a lost bird. Previously, there were only sporadic records in Beidaihe, Hong Kong, Shantou and Taiwan. This record is the first in Shanghai.