of up to 70% fish, 20% squid, and 2% crab. Also eaten are other crustaceans, cephalopods and sometimes birds. In rare instances, they have even been documented attacking and eating sharks. A recent incident occurred off Cape Point, South Africa, where a large male was observed attacking and killing five blue sharks between 1.0 and 1.4 m long. Observers concluded that the seal likely killed the sharks to eat the fish-rich contents of their stomachs, as well as their livers as a source of energy. The Australian fur seal mostly eats squid, octopus, fish, and lobsters. The brown fur seal dives for its food. The African subspecies can dive as deep as 204 m and for as long as 7.5 minutes. The Australian subspecies generally feeds at lower depths, diving on average 120 m and can reach as deep as 200 m. The brown fur seal's main predator is the great white shark, although they are also preyed upon by various other animals, such as killer whales and vagrant southern elephant seals. Land-based predators include black-backed jackals, brown hyenas and occasionally lions on the Skeleton Coast in Namibia. In addition, seagulls are thought to peck the eyes out of baby seals to render them helpless and disabled, as they begin to feast on their flesh. In False Bay, the seals employ a number of antipredatory strategies while in shark-infested waters, such as: Swimming in large groups and harassing sharks in the vicinity Low porpoising to increase subsurface vigilance Darting in different directions to cause confusion when attacked Using their greater agility to stay out of reach Riding near the dorsal fin to keep out of reach of the shark's jaws when attacked Behaviour Acoustic behavior Australian fur seals are social animals that use vocalizations in a broad range of contexts. These vocalizations have been shown to contain individually unique properties important for enabling individual recognition. This is particularly important for the reunion of mothers and pups that experience repeated separations whilst mothers are out at sea foraging, sometimes for days at a time. Upon their return, mothers need to locate their pups. This reunion process may also be facilitated through a combination of smell and spatial cues. In males, increases in testosterone and calling rates are seen in conjunction with the onset of the breeding season. Males can also differentiate neighboring males from stranger males, responding more aggressively to the