A Willow Warbler (Phylloscopus trochilus) stopping over on the island of Helgoland (Germany) for some food and rest. (IMAGE)

Proceedings of the National Academy of Sciences

A Willow Warbler (Phylloscopus trochilus) stopping over on the island of Helgoland (Germany) for some food and rest.

Caption

A Willow Warbler (Phylloscopus trochilus) stopping over on the island of Helgoland (Germany) for some food and rest.

Credit

Image credit: Heiko Schmaljohann (Heligoland Bird Observatory, Wilhelmshaven, Germany)

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