The black tern is 9.1-14.2 inches (23-36 cm) in length with a wingspan of 22.4-23.6 in (57-60 cm).
It has a very sharp and slender bill, which it uses to grab insects out of the water, and long wings that it uses to glide in the air.
The black tern has different coloring depending on the season. During the summer breeding season, the black tern’s head, chest, and wings are dark gray. In the winter, its head and underside are white while the wings remain gray.
The black tern spends the summer inland in marshes with dense vegetation and pockets of shallow, open water. In the winter, the black tern migrates to the northern coast of South America.
During the breeding season, the black tern eats invertebrates such as dragonflies, damselflies, grubs, and small mollusks. It also eats small freshwater fish. During the winter, small marine fish and plankton make up the black tern’s diet.
The male black tern performs an elaborate courtship ritual to attract females, which includes flying into the air with a fish in its mouth. It nests in small colonies in inland marshes. Nests are sometimes built on a muskrat house or on a mass of floating plants in shallow water.
Females lay three eggs between May and early August. She incubates the eggs for 22 days. Young terns leave the nest early, first by swimming and then flying. Young terns can fly after about three weeks.
The oldest black tern on record lived to be a little over 11 years old.
When feeding, the black tern hovers over the water with its beak pointed down. When ready, it makes a sudden drop or swoop to grab the insect in its bill.
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The black tern does not breed in New Hampshire, but it can be spotted in the state during migration.
In the summer, the black tern is found across Canada and the northern United States.
It moves throughout the United States and Central America during migration, eventually landing on the northern coast of South America for the winter.
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