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Procellariiformes (from the Latin procella, a storm) is an order of birds formerly called Tubinares and still called tubenoses in English.

They are all highly pelagic seabirds, and all of them have their nostrils enclosed in one or two tubes on their straight, deeply grooved bills with hooked tips. The beaks are made up from several plates. Wings are long and narrow; feet are webbed, and the hind toe is undeveloped or non-existent. Plumage is predominantly black or gray.