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Procellariiformes is an order of seabirds that comprises four families: 
- the albatrosses, 
- the petrels 
- and shearwaters, 
- and two families of storm petrels. 

Formerly called Tubinares and still called tubenoses in English, procellariiforms are often referred to collectively as the petrels, a term that has been applied to all members of the order, or more commonly all the families except the albatrosses.