Concept information
Preferred term
CBC
Definition
- The CBC "is the oldest and largest wildlife survey in the world" (Butcher 1990). The National Audubon Society sponsors the survey and publishes results. It is designed as a series of circular count areas, and birders count birds within these "circles" each year on a prespecified day around 25 December. With lots of circles (over 1,500) and a long history (the CBC was started in 1900), it is hard to dispute Greg Butcher's "oldest and largest" label for the survey (Butcher 1990). For more information, link to "http://www.mbr-pwrc.usgs.gov/bbs/int1cbc.html" (en)
Broader concept
- A - C (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/a27803de-4a71-46c7-a75c-f867f7214545
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