Why do birds consistently follow certain routes in their migrations? Pathways of migration evolved, shaped by the wind. During the height of the last ice age, ice-free breeding habitat for songbirds remained in what is now Alaska and parts of Western Canada. Studies of fossil pollen show…

At first glance, many of the sparrows in North America look pretty much the same: like small, drab-colored songbirds hanging out on the ground. But these “little brown jobs” can be fun to identify if you know what field marks to look for!

Owls have a reputation for hooting and hunting at night. But when you take a look – and listen – to the 19 species that live in the U.S. and Canada, it’s clear that these raptors defy stereotypes.

Most birds molt and regrow their flight or wing feathers — one at a time along each wing — to stay in prime condition for flying. But for a Wandering Albatross, with a whopping 10-to-12-foot wingspan, that’s a big job! It takes the large albatrosses a full year to molt, and they have to…

Before the high-tech gadgets used to track bird migration today, there was moon-watching: a technique dreamed up in the 1940s by ornithologist George Lowery. Using telescopes pointed at the moon to see the silhouettes of migratory birds, Lowery helped show that birds regularly migrate…

Williamson's Sapsuckers nest in western mountain forests. The radically different plumages of the male and female so confounded 19th-century naturalists that, for nearly a decade, the birds were thought to be of different species. Sapsuckers are unique among woodpeckers in drilling neat…

The Bicknell’s Thrush is known for scarcity… and promiscuity. Unlike most songbirds, the female thrush establishes a territory and then mates with males that happen by. She then lays eggs that have been fertilized by multiple different males. Many of those males will stick around and help…

Ornithologist Bill Evans has helped us better understand the sounds that birds make as they migrate at night. Known as nocturnal flight calls, many species can be identified based on their signature sound. Using special handmade microphones left outside overnight, Evans, his colleagues and…

When you provide places for migratory birds to rest and refuel, you’re helping them complete their long journeys and reach their destination safely. In a similar way, BirdNote also relies on your generosity. As an independent nonprofit, we depend on support from listeners like you to keep…

In June 1853, Thoreau wrote of an enchanting encounter with the Wood Thrush: "This is the only bird whose note affects me like music. It lifts and exhilarates me. It is inspiring. It changes all hours to an eternal morning." Wood Thrushes thrive in large expanses of forest. And their…