Previous research has shown birds frequently eavesdrop on other bird species to glean information about potential food ...

A rare anhinga sighting in Boulder County excites birdwatchers. The tropical bird had only been documented three times in Colorado.

A water bird rarely seen in Colorado appears to be taking a summer vacation at a private Boulder County pond, to the delight ...

For more than a century, the USGS program has revealed crucial insights about where birds go, how they’re faring, and what we ...

Unlike birds whose plumage is mostly blue, the green coloring of a green bird’s feathers is primarily a combination of pigment and structure, not just a trick of the light. These birds’ emerald green, ...