On my land in the Black Forest, north of Colorado Springs, Colorado, the black-capped chickadees are up to something. They don’t migrate, but the notes in their spring song have. It may be a stretch ...

MILWAUKEE - One of Wisconsin's smallest and toughest birds just so happens to also be one of our first signs of spring. In January, a noticeable new sound can be heard across forests, neighborhoods ...

In some environments songbirds exhibit inconsistency in their songs which may be caused by non-lethal levels of contaminants that persist in the sediments of the Hudson River region. Biologists ...

Within a network of communicating individuals, animals may gather information about the relative quality of conspecifics by eavesdropping on their signalling interactions. For territorial male ...