Eurasian reed warblers migrate northeast during spring. What evidence suggested that they were capable of bicoordinate navigation after individuals were captured and experimentally displaced 1000 km east during spring migration?

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The Eurasian reed warblers, when displaced 1000 km east, began migrating to the northwest. This change in direction from their usual northeast spring migration path suggested that they were capable of bicoordinate navigation. They adjusted their route to compensate for the displacement, indicating an ability to determine their geographical position relative to their destination and alter their migratory path accordingly.

Eurasian Reed Warblers Migrate Northeast During Spring