Aha!

https://commons.wikimedia.org/wiki/File:Rostocker_Pfeilstorch.jpg
Image: Wikimedia Commons

In 1822, when Europeans were still searching for an explanation for the annual disappearance of some bird species, a white stork appeared bearing a central African arrow in its neck. This helped to show that some birds migrate long distances for the winter.

The stuffed stork can be seen today at the University of Rostock, where it bears the magnificent name Rostocker Pfeilstorch (“arrow stork from Rostock”).