Overall, the drop was from about 10 billion birds in 1970 to about 7 billion now. The cause is primarily habitat loss, as birds are losing the places they need to live, find food, rest and raise ...

Bird populations in the United States and Canada have dropped by 29% since 1970, signifying 2.9 billion birds lost in almost 50 years, according to a new study.

Over the last 50 years, the U.S. and Canada have slowly but surely lost 29% of their bird populations — amounting to nearly 3 billion birds. The shocking loss could be a sign of an ecological ...

Grassland birds had the greatest loss, with their population going down by 53 percent since 1970—more than 700 million fewer animals. “Grasslands really are the most threatened terrestrial ...

WASHINGTON — North America’s skies are lonelier and quieter as nearly 3 billion fewer wild birds soar in the air than in 1970, a comprehensive study shows. The new study focuses on the drop in ...

The number of birds in the United States and Canada has fallen by 29 percent since 1970, scientists reported on Thursday. There are 2.9 billion fewer birds taking wing now than there were 50 years ...

More than one in four North American birds have disappeared since 1970, signaling the development of potentially deeper ecological problems in the region, according to a new study co-authored by ...

According to a study released on Thursday, Sept. 19, 2019, North America’s skies are lonelier and quieter as nearly 3 billion fewer wild birds soar in the air than in 1970.

Bird populations in the United States and Canada have dropped by 29% since 1970, signifying 2.9 billion birds lost in almost 50 years, according to a new study.

WASHINGTON (AP) — North America's skies are lonelier and quieter as nearly 3 billion fewer wild birds soar in the air than in 1970, a comprehensive study shows. The new study focuses on the drop in ...