Feeding behaviors by rough-toothed dolphins, Steno bredanensis (Lesson, 1828), were opportunistically observed on seven occasions, in Ilha Grande Bay, Brazil southeastern coast, from 1990-1998. The preys were mullet (Mugil sp. and Mugil curema), cultlass fish (Trichiurus lepturus) and balao (Hemirhamphus brasiliensis). On one occasion, rough-toothed dolphins were feeding in association with bottlenose dolphins (Tursiops truncatus). Magnificent frigate birds (Fregata magnificiens) and brown boobies (Sula leucogaster) were associated with rough-toothed dolphins on three occasions.