North America has lost nearly 3 billion birds since 1970, a study says. ... Other threats to birds include deaths because of free-roaming cats, collisions with glass, ...

There are almost 3 billion fewer birds in the United States and Canada now than in 1970, according to a disturbing new study. That amounts to a 29 percent drop in the avian population over the ...

There are nearly 3 billion fewer birds in North America today than there were in 1970 — a population decrease of nearly one third, according to a study published Thursday.

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 ...

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 ...

Billions of birds in North America are gone, silently disappearing over the last 50 years, raising concerns that common birds like sparrows and blackbirds could one day disappear. 71 ...