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Historical Bird Migration Card

Detailed Description

Image scan of a historical bird migration card (1904). This is just an example of the more than 6 million handwritten cards stored in government files, in the North American Bird Phenology Progam, with more than a century of information about bird migration, a veritable treasure trove for climate-change researchers because they will help them unravel the effects of climate change on bird behavior.

This card: House Wren


Public Domain.