At Large gallery 2019-bluebird wing

At Large gallery 2019-bluebird wing

closeup of feathers on bluebird wing

Gently spread by a researcher, the wing of an eastern bluebird offers clues to the bird's age and fitness. This bird was captured as part of a study by ecologists Julian Avery and Margaret Brittingham, with graduate student Danielle Williams, on how chronic noise from Marcellus Shale gas transport affects breeding behavior of songbirds.

IMAGE: Julian Avery [instagram.com/evolutionavery]