Pfeilstorch

hercules

The term Pfeilstorch (German for “arrow stork”) is given to storks injured by an arrow while wintering in Africa, before returning to Europe with the arrow stuck in their bodies.

[…] Pfeilstorch was crucial in understanding the migration of European birds. Before migration was understood, people had no other explanation for the sudden annual disappearance of birds like the white stork and barn swallow. Some theories of the time held that they turned into mice, or hibernated at the bottom of the sea during the winter

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