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 ...

Benjamin Sonnenberg receives funding from the National Science Foundation. Wet snow pelts my face and pulls against my skis as I climb above 8,000 feet in the Sierra Nevada of eastern California, ...

Black-capped Chickadees don’t let food go to waste. These puffy little birds, with their oversize head and dark eyes resembling those of a Beanie Baby, are always hoarding extra grub such as berries, ...

Sofia Marie Haley does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...