 Off the [[Fernando de Noronha|Fernando de Noronha Archipelago]] in the southeast Atlantic it has been observed feeding on the faeces and vomit of [[spinner dolphin]]s ("Stenella spp") and this feeding off mammalian waste has been suggested to be simple behavioural change from feeding on plankton to picking out drifting particles of waste.When feeding on algae they appear to prefer brown algae.