Why are bluebirds blue? Unlike many other bird colors, blue is not a pigment but a color produced by the structure of the feathers. Tiny air pockets and melanin pigment crystals in each feather scatter blue light and absorb the other wavelengths. The even finer structure of the feather…

To celebrate BirdNote's 10-year anniversary, we asked BirdNote founder Chris Peterson how she came up with the idea for the show. The StarDate public radio program provided inspiration. “I had this idea grab me around the neck,” Chris recalls. “Why don’t we do for birds what StarDate does…

In the world of birds, you’ll find King Penguins, King Vultures, King Eiders, 89 species of kingfishers, 11 species of kingbirds, and three species tiny kinglets. But of the 10,000 species of birds around the globe, there are no “queens.”* Once upon a time, there was a species of bird-of…

The Gunnison Sage-Grouse is one of the rarest birds in the United States. It was only recently acknowledged as its own species, separate from the Greater Sage-Grouse. In November 2014, it was listed as "threatened" under the federal Endangered Species Act. The striking males are consummate…

December 26th is known in the British Isles and elsewhere as Saint Stephen's Day, in honor of the first Christian martyr. Beginning in the 16th Century, local lads would go forth for a yearly wren hunt. The wren was protected the rest of the year, but the day after Christmas, the "Wren…

In a forest on Martha’s Vineyard, a Heath Hen struts through the brush. Columbus, Ohio, harbors a Passenger Pigeon. In Okeechobee, Florida, you can find a Carolina Parakeet. A Great Auk scans the Atlantic Ocean from atop a rock on Fogo Island, Newfoundland. A sea-going Labrador Duck rests…

More than 1.5 million Eared Grebes, 30% of the North American population, gather at Mono Lake each fall. But as late as the 1990s, the lake was gravely threatened by the diversion of its water to Los Angeles. After years of court battles, Los Angeles, the lake's advocates, and concerned…

It's September, and millions of shorebirds are on the move. Most nest in high northern latitudes, such as the Arctic tundra. And a surprising number fly all the way to South America. This young Hudsonian Godwit might have hatched near Hudson Bay or in extreme northwest Canada, and it will…

Imagine watering your garden on a hot August day, when a small yellow-and-gray warbler flutters into the spray and begins taking a shower. The Yellow-rumped Warbler, probably mid-way through its fall migration, is unafraid. Yellow-rumped Warblers use many types of habitat. They breed high…

In New Guinea in the 1960s, scientist Jared Diamond documented birds like this Mountain Kingfisher living at all elevations on Mount Karamui. Today, scientists Ben and Alexa Freeman have documented an important change. Birds are moving “upslope” to escape warming temperatures that are…