When scientists looked at climate data for more than 8,500 robins’ nests in the US, they found that robins will nest only if the mean noon temperature is between 45 and 65 degrees. But even more critical is relative humidity: it needs to be around 50 percent in the middle of the day. What…

The Rock Pigeon is the quintessential urban bird. Early European settlers at Jamestown and Plymouth introduced it to North America in the 1600s, and it is now found across the entire country. Flocks roam parks and city streets and sit on wires and billboards. Be part of our flock of…

Right now, volunteer observers are counting shorebirds on the move. Sandpipers, dowitchers, plovers, Dunlin, and others that raised their young in the Arctic are now making southbound migrations. They're looking for places to feed and rest along the way. On Crockett Lake in Washington…

Every year, the change from winter to spring brings millions of Cliff Swallows from Argentina to North America. Since the early 1800s, swallows had returned, year after year, to the Mission of San Juan Capistrano. But during a restoration project in the 1990s, the venerable mud nests were…