English: Gerhard Heilmann's comparative illustrations of the feet and scale shields of various extant birds and reptiles: green lizard (1), viviparous lizard (2), alligator (3), hooded crow (4), pheasant (5), black grouse (6), and ptarmigan (7).
Date
Source
The Danish book Vor Nuvaerende Viden om Fuglenes Afstamming
The author died in 1946, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 75 years or fewer.
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|Description = Gerhard Heilmann's comparative illustrations of the feet and scale shields of various extant birds and reptiles: green lizard (1), viviparous lizard (2), alligator (3), hooded crow (4), pheasant (5), black grouse (6), and
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