If the skies above North America seem quieter, it’s because of the massive drop in the bird population in the past 50 years.
A report in the journal Science says there are 3 billion fewer birds in the United States, Canada and Mexico than 1970 — a 29% drop.
Conservationists call it a widespread ecological crisis.
“One of the scary things about the results is that it is happening right under our eyes. We might not even notice it until it is too late,” lead author of the study Kenneth Rosenberg of Cornell University says.
More than 90% of the losses were among 12 read more >>>