When black-capped chickadees and some other birds in the Anchorage area began turning up in the late 1990s with elongated, weirdly curved or twisted beaks, biologists and bird lovers began to worry.

NORTH SLOPE, Alaska — “Chick chick whirrr, chick whirrr.” Although it was a recorded birdsong that chattered through each of the poplar stands we entered, I still occasionally caught myself believing ...

Researchers in Anchorage are working to crack a tough nut in the form of a beak deformity affecting a large portion of black-capped chickadees and other birds in parts of Alaska, including the Kenai ...

During the darkest days of Alaska’s winter, black-capped chickadees stuff themselves with enough seeds and frozen insects to survive 18-hour nights. Where the chickadees spend those long nights was a ...