Black-capped (Poecile atricapillus) and mountain (P. gambeli) chickadees are common backyard birds native to the Colorado Front-Range with broadly overlapping distributions in western North America.

The chickadee flew right past me to a tree 15 feet away and disappeared into a hole in a gnarly ponderosa pine. It emerged less than a minute later, watched me for a moment and left to collect more ...

Ms. Renkl is a contributing Opinion writer who covers flora, fauna, politics and culture in the American South. Spring is proceeding apace in this yard, despite my worst fears. For 28 of the 29 years ...

Ben Sonnenberg, a doctoral student in the Ecology, Evolution and Conservation Biology program, studies chickadees with Vladimir Pravosudov. Sonnenberg has coauthored many publications about the ...

Now is the time of the year black-capped chickadees seek nest sites for the breeding season. This species is a year ‘round resident and is considered an obligate cavity nester and will use nest boxes ...

Chipping sparrows sail in to perch regularly on the uppermost twig of one in a clump of native eastern red cedars, always a little caterpillar or bug dangling from their beaks. Then they drop down ...

DEAR JOAN: A few months ago, we built a nest box for a screech owl as we had heard some in our area. Now, several months later, after mounting the box in a tree and filling it with wood shavings, ...

Mountain chickadees struggle with snow extremes. Benjamin Sonnenberg. Wet snow pelts my face and pulls against my skis as I climb above 8,000 feet in the Sierra Nevada of eastern California, tugging a ...

Wet snow pelts my face and pulls against my skis as I climb above 8,000 feet in the Sierra Nevada of eastern California, tugging a sled loaded with batteries, bolts, wire and 40 pounds of sunflower ...