New study finds US and Canada have lost more than 1 in 4 birds in the past 50 years
(PHYSorg.com Biology)

A study published today in the journal Science reveals that since 1970, bird populations in the United States and Canada have declined by 29 percent, or almost 3 billion birds, signaling a widespread ecological crisis. The results show tremendous losses across diverse groups of birds and habitats-from iconic songsters such as meadowlarks to long-distance migrants such as swallows and backyard birds including sparrows.