The birds of Calcutta / by Frank Finn.

  • Frank Finn
Date:
1917
Catalogue details

Licence: In copyright

Credit: The birds of Calcutta / by Frank Finn. Source: Wellcome Collection.

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    pure-green strain died out on account of unfavourable conditions, the blue-throated and chestnut-headed varieties would be two distinct species. But of course this does not explain how the different varieties arose in the first place, which is the real problem of the origin of species.
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