Procellaria's a genus of southern ocean long-winged seabirds All five species are named as 'petrel', although they were thought to be more closely related to the shearwaters and current research places them closer to the prions. They're large shearwaters, found in the temperate and cold waters of the southern oceans. They're pelagic outside the breeding season. These tubenose birds fly with stiff wings, and use a “shearing” flight technique to move across wave fronts with the minim… (More on Procellaria)