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Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year. It is typically from north to south or from south to north. Migration is inherently risky, due to predation and mortality. The Arctic tern holds the long-distance migration record for birds, travelling between Arctic breeding grounds ...
Zugunruhe is borrowed from German; it is a German compound word consisting of Zug, "move, migration," and unruhe (anxiety, restlessness). The word was first published in 1707, when it was used to describe the "inborn migratory urge" in captive migrants.
Bird migration is controlled primarily by day length, signalled by hormonal changes in the bird's body. [20] On migration, birds navigate using multiple senses. Many birds use a sun compass, requiring them to compensate for the sun's changing position with time of day. [21] Navigation involves the ability to detect magnetic fields.
The Bird Migration Explorer, launched on September 2022, is an online tool that allows visitors to track the journeys of more than 450 migratory birds that regularly occur in the United States and ...
When migration season begins, Ruby-throated hummingbirds are still abundant throughout the eastern half of the U.S., according to the Audubon Society's online bird migration explorer tool. "By ...
Warmer springs bring changes in bird migration. Spring’s arrival has always shown variation. It may be early. It may be late. But researchers say the data studied over several decades shows ...
The passing of the Migratory Bird Treaty Act of 1918 in the United States resulted in a need for more information on bird migration. Frederick Charles Lincoln was put in charge and improved methods for trapping and banding, developed record-keeping procedures, recruited banders, fostered international cooperation, and promoted banding as a tool for research and wildlife management.
Migration is a complicated affair. Some birds arrive here after only a short jaunt north, having spent the winter maybe no farther south than coastal states.