The article More Than Half of Earth’s Migratory Bird Species are Declining by Peter Marra – Nathan W. Cooper (CounterPunch) writes,

“We found that more than half of the world’s migratory bird species are declining because of an array of threats, including habitat loss, invasive species that harm birds, collisions with buildings, hunting, the pet trade, toxic pesticides and, in some cases, being caught in commercial fishing nets. But our study offers a second conclusion with more hope. The science around migratory birds has changed... [More]”