Preening is a behaviour in birds where they groom themselves. The birds which may have tiny organisms on them, have their feathers ruffled or have to clean plumage will preen themselves. There are many ways with which birds preen themselves. Birds will fluff up and shake their feathers which helps to realign the individual hairs on their feathers, use their beak to scrape off dirt, etc
Allopreening
Just as monkeys sometimes gather in groups and clean each other of mites and dirt, some birds also preen another bird. Allopreening is generally restricted to the neck or head of the other bird.
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