These teal are among the first ducks to migrate each fall, and one of the last in the spring.
Cinnamon Teal
In the Pacific Flyway, cinnamon teal are far more common than blue-wings. The hens look alike and the habits of both species are similar.
The pale blue forewing patch is the best field mark, as drakes are usually in eclipse until January or longer.
Drakes have a whistling peep; hens utter a low quack.
Green-Winged Teal
Length--15 in. Weight--14 oz.
Quite hardy--some birds stay as far north as open water is found.
The smallest and one of the most common of our ducks. Their tiny size gives the impression of great speed, but mallards can fly faster. Their flight is often low, erratic, with the entire flock twisting and turning as one unit.
They nest as far north as Alaska, and migrate in all four flyways. Early fall drakes are usually still in full eclipse plumage.
Drakes whistle and twitter; hens have a slight quack.
Wood Duck
Length--18-1/2 in. Weight--1-1/2 lbs.
Found in all flyways; most numerous in the Atlantic and Mississippi flyways and fewest in the Central.
They are early migrants; most of them have left the northern States by mid-November.
Frequents wooded streams and ponds; perches in trees. Flies through thick timber with speed and ease and often feeds on acorns, berries, and grapes on the forest floors.
Flight is swift and direct; flocks are usually small.
In the air, their wings make a rustling, swishing sound. Drakes call hoo-w-ett, often in flight; hens have a cr-r-ek when frightened.
Black Duck
Length--24 in. Weight--2-3/4 lbs.
A bird of the eastern States, primarily the Atlantic Flyway and, to a lesser extent, the Mississippi.
Shy and wary, regarded as the wariest of all ducks.
Often seen in company of mallards, but along the Atlantic coast frequents the salt marshes and ocean much more than mallards.
Flight is swift, usually in small flocks.
White wing lining in contrast to very dark body plumage is a good identification clue.
The hen's quack and the drake's kwek-kwek are duplicates of the mallards.
Diving Ducks
Diving ducks frequent the larger, deeper lakes and rivers, and coastal bays and inlets.
Ducks At a Distance: a Waterfowl Identification Guide · The Wunder Library — complete classics, free to read, with narration.