The Chimney Swift is a good example of a common bird in steep decline. Although the species is still common in many urban areas, it has declined by 67% since 1970 © Lawrence M. Johnson (https://www.flickr.com/photos/117800205@N05/)
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The Chimney Swift is a good example of a common bird in steep decline. Although the species is still common in many urban areas, it has declined by 67% since 1970 © Lawrence M. Johnson (https://www.flickr.com/photos/117800205@N05/)