Most Barn Swallows migrate south for the winter. But recently, small populations have stayed through the winter, seeking out pockets of flying insects for food. To learn more about this winter surprise, visit BirdWeb.org.

Not only do Cackling Geese sound different, but they also look different from Canada Geese, and their DNA is different. The Cackling Goose was defined in 2004 as a species separate from the Canada Goose.

In late September, young Great Horned Owls, now called "juveniles," still roost close together. By mid-October, the juveniles will scatter - or be driven away by the adults - to set up their own territories within a few dozen miles. By age two, they will seek their own mates. Learn about…

From atop a thermal, Turkey Vultures in groups of up to 200 sail across the Strait of Juan de Fuca, making landfall near Salt Creek County Park on the Olympic Peninsula. The Olympic Peninsula Audubon Society sponsors a free field trip to witness this autumnal passage. Check out that or…

The largest known swift roost in the world - over 30,000 Vaux's Swifts - can be seen each September in Portland, Oregon, in a chimney at Chapman Elementary School. Portland Audubon hosts a Swift Watch. Learn more about this program and be sure to see a video of the swifts swirling down the…

Wind farms allow us to convert renewable wind energy into electricity. The concept seems environmentally benign, but the windmills are often installed along the same ridges favored by migrating birds for their currents. The farms would be less hazardous to migratory birds if they were…