The BBC: Bird populations in US and Canada down 3bn in 50 years.

BBC Science correspondent Victoria Gill reports on two studies which shows Bird populations in US and Canada down 3bn in 50 years.

Bird populations in Asia and the US are “in crisis”, according to two major studies.

The first concludes there are three billion fewer birds in the US and Canada today compared to 1970 – a loss of 29% of North America’s birds.

The second outlines a tipping point in “the Asian songbird crisis”: on the island of Java, Indonesia, more birds may now live in cages than in the wild.

Scientists hope the findings will serve as a wake-up call.

The two studies are published in the journals Science and Biological Conservation.

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https://www.bbc.com/news/science-environment-49744435