Correction appended. Cornell Lab of Ornithology conservation scientist Dr. Ken Rosenberg led an international team of 12 scientists in an analysis of decades of data on bird population — and the conclusion is disturbing. In the last 50 years, one in four birds in North America has disappeared.Pesticide use and loss of habitat to farmland are … Continue reading Ornithologists, Birdwatchers Uncover Staggering Magnitude of Bird Population Decline