Bird Migration Card - 1933
![Image: Bird Migration Card - 1933](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/BPPMigrationCards_Page_3.jpg?itok=cA2VeJ9y)
Detailed Description
Image scan of a historical bird migration card. 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: Ivory-billed Woodpecker
Sources/Usage
Public Domain.