With its long neck a "Great Blue Heron" makes it appear easy to preen even the most awkwardly positioned feathers on its body.
Birds preen in order to keep their feathers in the best condition. While preening they remove dust, dirt and parasites and align each feather to its optimum position relative to adjacent feathers and body shape. Most birds will preen several times a day. Most birds contain a uropygial gland or preen gland witch is found near the base of the tail and produces an oily, waxy substance that helps waterproof the feathers and keep them flexible. While preening, the birds spread this oil to each feather so they are evenly coated and moisturized which keeps their feathers flexible and strong.
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