Bald eagles can weigh up to 14 pounds and attain a height of 3 to 3 1/2 feet. They have a huge wing span of 6–8 feet. Typically, the female of the species is larger that the male and bald eagles living in the north are believed to be larger than ones in the south. They can live up to 30 years in the wild and even longer in captivity.
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Canvasback Duck (Aythya valisineria)
The canvasback is a diving duck that is found only in North America. It is 13-19 inches in length with a wingspan of 34 inches. The male has a grayish-white body, a black chest and tail, a copper colored head and neck and red eyes. The female has a speckled gray body with a brown head and neck and brown eyes. The canvasback has a long sloping forehead and a long pointed black bill. 
Their breeding habitat is North American prairie wetlands. The bulky nest is built from vegetation in a marsh and lined with down. Loss of nesting habitat has caused populations to decline. Canvasbacks usually take new mates each year, pairing in late winter.
Canvasbacks are strongly migratory and overwinter on the coasts of the United States, the Great Lakes and British Columbia in saltwater bays, estuaries or lakes. This species is a very rare vagrant to western Europe.
Canvasbacks feed mainly by diving, sometimes dabbling, mostly eating aquatic plants with some molluscs, aquatic insects and small fish. Wild celery, Valisneria americana, is a favourite food and is the origin of this bird's species name.
The canvasback sometimes lays eggs in other canvasback nests.
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