English: Gerhard Heilmann's skeletal illustrations of the Berlin Archaeopteryx specimen, then known as Archaeornis, compared to the skeleton of a modern pigeon.
Датум
Извор
The Danish book Vor Nuvaerende Viden om Fuglenes Afstamming
{{Information |Description = Gerhard Heilmann's skeletal illustrations of the Berlin ''Archaeopteryx'' specimen, then known as ''Archaeornis'', compared to the skeleton of a modern pigeon. |Source = The Danish book ''Vor Nuvaerende Viden om F