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www.thespruce.com/why-birds-preen-386448

Birds have up to 25,000 feathers, and regular preening keeps each one of those feathers in top condition. Second only to feeding, preening is a common bird behavior easily observed in a yard, out in the field, or even among captive birds or pets. Understanding why and how birds preen can help birders better appreciate their beautiful avian friends.

en.wikipedia.org/wiki/Preening_(bird)

Preening is a maintenance behaviour found in birds that involves the use of the bill to position feathers, interlock feather barbules that have become separated, clean plumage, and keep ectoparasites in check. Though primarily an individual function, preening can also be a social activity involving two or more birds, which is known as allopreening.

pets.thenest.com/several-reasons-birds-preen-feathers-12764.html

When your bird preens, he grooms himself by passing each feather on his body through his beak. With thousands of feathers to tend to, preening can occupy a lot of your bird's time. It's worth it: preening plays an important role in your bird's health and his ability to fly.

www.youtube.com/watch?v=hVk1-iHtLe4

Preening is a bird's way of grooming its feathers to keep them in the best condition.While preening, birds will remove dust, dirt and parasites from their feathers and align each feather in the ...

www.youtube.com/watch?v=JtfXbGMtG24

Almost all the birds are found preening their feathers with their beaks. Why do they do so?

healthypets.mercola.com/sites/healthypets/archive/2018/05/08/bird-preening.aspx

Preening, which is what birds do when they clean or straighten their feathers with their beak, helps keep birds’ feathers healthy; Most birds have a preen gland, or uropygial gland, located near the base of their tail that secretes an oily substance

earthlife.net/birds/preening.html

The birds apply the oil to their feathers during preening. An action you often see birds performing and which involves the bird using its bill to manipulate its feathers to ensure they are all zipped up and lying flat, one on the other like tiles on a roof of a house.

www.reference.com/pets-animals/birds-preen-feathers-5ba09b849dd737da

Birds preen their feathers to keep them in prime condition. Preening improves the look of the feathers, removes dust and parasites, and aligns the feathers. As a bird preens, it secretes oil from the uropygial gland, which is spread to every feather and helps to waterproof the feathers. Aligning the feathers makes them aerodynamic for better ...

www.birdlife.org/asia/news/bird-preens-its-feathers-0

The feathers wear out, so many birds molt once a year to get new ones, but molting only once a year is not enough for them to maintain their flight power, and secure insulation and waterproof property of feathers. So they continually take care of their feathers in various ways including preening, birds, in order to get rid of dirt and ...

academy.allaboutbirds.org/feathers-article

Understanding feather anatomy at the microscopic level provides insight into how feathers function. For example, the interlocking Velcro-like structure on many bird feathers creates the smooth, flexible, and resilient surface that supports flight and sheds water. As feathers grow, they mature into highly branched structures.