Like human fingernails, birds’ beaks grow continually throughout their lives and are worn down by eating and other habits. In black-capped chickadees and other birds affected by the deformity ...

A bird beak deformity first recorded among black-capped chickadees near Anchorage has been increasingly seen in crows in Southeast Alaska, broadening a mysterious phenomenon.

Chickadees with beaks over an inch long, the mandibles crossing each other like folded arms, are being found in disturbing numbers in Alaska. Other bird species also are showing this peculiar ...

Yet, scissor beak is among the most obvious because it’s a clear deformity of a bird’s upper and bottom beaks. It’s not common, and it frequently affects poultry—though it can affect pet ...

Avian experts warn people not to feed birds amid a highly contagious and incurable virus that causes feather loss and beak deformities, ultimately resulting in a "long, slow death".