Definition: Psittacine Beak and Feather Disease (PBFD) is a virus that can infect any hookbill. The disease attacks the bird's feathers, beak, and internal systems including the immune system. Outward symtoms include feather loss and abnormal beak growth.
PBFD (Psittacine Beak and Feather Disease)
By Alyson Burgess, About.com
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