How 600,000 citizen scientists helped calculate that Earth is home to 50 billion birds – ABC News

Data collected by 600,000 citizen scientists around the world has been used to calculate how many birds and bird species there are on Earth.
Key points:

• There is an estimated 9,700 different wild bird species in the world but only a few species have a population of more than a billion
• Wild birds are threatened by climate change, urbanisation and agriculture
• There are about six birds per every human being in the world

The new study, which aims to help conservation efforts, estimates there are 50 billion…

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