Add Yahoo as a preferred source to see more of our stories on Google. Mountain chickadees are unusual in having more complex calls than songs. Vladimir Pravosudov I approach a flock of mountain ...

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 ...

Members of the Pravosudov lab catch and release resident chickadees to attach identifying bands that allow the researchers to track individual birds.(Sofia Haley) I spend my days out at our field site ...