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How Many Birds in the World?

1 month ago   |   By Ornithology

According to a recent study*, there are about 50 billion living birds in the world, six times as many as there are people. It was not easy to come up with that figure but the diagram below gives a graphic representation of how the researchers did it. It's not easy to understand, but basically, using eBird data, accurate censuses of birds in a given region, comparing relative abundances of birds, and extrapolating from there, the authors came up with 50 billion (a previous study in 1997 estimated between 200 and 400 billion).
A number of bird species in this study have small populations...
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