Northwestern Crow with an elongated upper beak
Detailed Description
Northwestern Crow with an elongated upper beak in Seward, Alaska. Avian keratin disorder (AKD) is a disease characterized by debilitating beak overgrowth and other abnormalities of keratinized tissues. Affected birds have difficulty feeding and preening and may suffer high rates of mortality.
Sources/Usage
Copyright for use only by USGS