Informing how birds know when and where to stop migrating, researchers using nearly a century’s worth of data find that the Eurasian reed warbler uses variations in Earth’s magnetic field as a “stop sign” that signals when it’s arrived at its destination.
Many migratory species undertake incredibly long migrations throughout a year. Much research has focused on understanding how these animals know where to go and how to return, and most work has focused on understanding how animals know—or learn—routes and directions. Equally important, however, is how they know when and where to stop migrating. Wynn.
—SNVAlthough it is known that birds can return to their breeding grounds with exceptional precision, it has remained a mystery how they know when and where to stop migrating. Using nearly a century’s worth of Eurasian reed warbler ringing recoveries, we investigated whether fluctuations in Earth’s magnetic field predict variation in the sites to which birds return.
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