Peak bird migration is about to start in Colorado and around the country. Here are tools for tracking and identifying the millions of migrants.

The 1979 book “Birds of Colorado’s Gunnison Country,” describes the male mountain bluebird as a “piece of the sky clipped out and fallen to earth.” Indeed, this species’ azure plumage is the namesake ...

PUEBLO, Colo. — Farmers in Colorado who raise birds are cautiously monitoring the bird flu outbreak. The Colorado Department of Agriculture reports the most recent cases were found in Larimer ...