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 ...

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 ...

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 ...

A mountain chickadee peers down from its perch in a ponderosa pine. Click here for larger image. Photo by Jeff Mitton. As the most recent glaciers subsided, ponderosa pines move north from their ...

I am pelted by wet snow 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 seeds critical to our ...

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 ...

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 ...