From OpenContent Curriculum
The Green-winged Teal is the smallest North American dabbling duck. The breeding male has grey flanks and back, with a yellow rear end and a white-edged green speculum, obvious in flight or at rest. It has a chestnut head with a green eye patch. Their call is somewhat of a high pitched whistle as they take flight.
It is distinguished from drake Common Teal (the Eurasian relative of this bird) by a vertical white stripe on side of breast, the lack of both a horizontal white scapular stripe and the lack of thin buff lines on its head. Although in the United States they are considered the same species. Both do occur in the Bering Strait Region.
The American form of the Green-winged teal (as pictured above) is considered of the subspecies Anas crecca carolinensis where as the Eurasian or Common version is of the subspecies Anas creca crecca.
The Green-winged teal is one of the most hunted second only to the Mallard.
Relevant Site Information
The Green-winged Teal is one of the most hunted birds although Northern Pintails are preferred. They nest on the island as well as on the mainland in tundra ponds and are very common.