Read about how birds take care of their feathers, and why the ritual is so important to their daily activities.
How should I care for my birds? – RSPCA Knowledgebase
How do birds move their feathers?
Swallows Singapore Birds
Feather Maintenance in Birds - Preening and Molting - Bird Buddy Blog
Birds hygiene is a top priority to keep their weathers in working order.
Preening - Wikipedia
Caring For Your Parrot's Feathers - Northern Parrots
Picking up baby birds can do more harm than good
Why Do Owls and Other Birds Have Feathers? by Holly Beaumont, Paperback