The White-bellied Storm-Petrel is very closely related to the Black-bellied Storm-Petrel (F. tropica), as the name implies the belly color is different but they also differ in the average water temperature they choose. The White-bellied prefers warmer water and breeds to the north of the Black-bellied, and can be considered a temperate rather than sub Antarctic breeder. Fregetta Storm-Petrels are generally grayish or blackish above, with a black hood, dark upperwings and tail with a pale carpal bar and white wing linings and largely white underparts below the hood. The White-bellied does lack a central black belly stripe, and further differs from the Black-bellied in its shorter (do not poke out behind the tail) legs, and pale tipped upperparts. Members of the Genus Fregetta forage in an unusual manner, skipping off waves using one leg, in an asymmetrical skip. The White-bellied Storm-Petrel is found both in the Pacific and Atlantic Ocean basins. Within South American waters it breeds on the Juan Fernandez and Desventuradas Islands off Chile and migrates north in winter to deep offshore waters off Chile and Peru.