The U.S bird population is shrinking. According to a report released today titled “The State of the Birds,” nearly a third of the country’s 800 species are endangered, threatened, or in “decline.” “The species in decline are being affected by climate change, habitat destruction, invasive species and disease, among other factors,” the report says. “More pedestrian threats, such as collisions with buildings and attacks by feral cats, have diminished birds’ numbers in some urban and suburban areas.” [WP]