English: Gerhard Heilmann's comparative illustrations of the embryos and adult life drawings of a crocodile (C), common fowl (F), lizard (L) and tern (T).
Datum
Izvor
The Danish book Vor Nuvaerende Viden om Fuglenes Afstamming
{{Information
|Description = Gerhard Heilmann's comparative illustrations of the embryos and adult life drawings of a crocodile (C), common fowl (F), lizard (L) and tern (T).
|Source = The Danish book ''Vor Nuvaerende Viden om Fuglenes Afstam
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