There are many different kinds of Tern so here is no single nswer to this.
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Answer #2
Depending on latitude Terns generally arrive at their breeding grounds in early to late May, usually in less than 3 Months most Terns have started their migrations.
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Arctic terns migrate all the way to the coast of Antarctica.
Antarctic Circle
Terns migrate, they do not hibernate, Birds cannot hibernate.
standing up
Arctic Terns live in Northern and Southern Hemispheres.
On average arctic terns migrate 56,000 miles each year. During the winter season you will find arctic terns in colder climates such as Alaska, the Antarctic, British Columbia, Northern Canada, and other such areas as this.
Many species do, terns, swallows, waterfowl, thrushes, many finches, are some examples.
Almost all birds migrate even if only for a few miles. There are thousands of birds that do migrate but a few are: Goose Swallow Woodland Kingfishers Peacock crow Artic Tern Rainbow Bee Eaters Bar Tailed Godwit
# they migrate down south
They migrate south for food
Arctic terns migrate farther than any other bird, making the round trip between the Arctic and the Antarctic, more than 40,000 kilometers, 21,750 miles, each year.
They migrate south for food