Black-capped Chickadee with a mildly deformed beak
![A Black-capped Chickadee with an upper beak slightly longer than the lower beak](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/3_BCCH_credit_Rachel_M_Richardson.jpg?itok=m9_pV3X9)
Detailed Description
A Black-capped Chickadee with an upper beak slightly longer than the lower beak. 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
Public Domain.