Who created "Bittern's Wings: study showing both sides"?

Bittern's Wings: study showing both sides was created by Albrecht Dürer|Albrecht Dürer in 1515.

What medium is "Bittern's Wings: study showing both sides"?

Bittern's Wings: study showing both sides is Watercolor on vellum.

Yes, Bittern's Wings: study showing both sides is in the public domain and available for free download under CC0 license.

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Albrecht Dürer|Albrecht Dürer, 1515