Black-capped Chickadee with a deformed beak that has grown long and curved down
![A Black-capped Chickadee with a beak that has grown long and curved down](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/2_BCCH_credit_Rachel_M_Richardson.jpg?itok=xxY7L9oH)
Detailed Description
A Black-capped Chickadee with a beak that has grown long and curved down. 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.