Read the full story from the University of Illinois.
According to a new study reported in the journal Science, bird populations in North America have experienced a troubling decline in the past five decades. The scientists estimate the continent has lost close to 3 billion birds, roughly 29% of their total numbers in 1970. Senior wildlife ecologist Thomas J. Benson of the Illinois Natural History Survey discusses the status of birds in Illinois with News Bureau life sciences editor Diana Yates. Benson leads the Critical Trends Assessment Program, which monitors the biological condition of the state’s forests, wetlands and grasslands, and collects data on plants, birds and arthropods.