One cue for determining position is using magnetic parameters. Birds may process such information using the ophthalmic branch of the trigeminal nerve (V1). The goal of this study was to test if V1 plays a role in the navigation of migratory Eurasian reed warblers after being displaced 1,000 km toward the east from their breeding ranges during spring migration. The hypothesis was that V1-sectioned birds would use vector navigation and behave like intact birds in Rybachy, while sham-sectioned birds would readjust their orientation because an intact V1 plays a role in true navigation.
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