Great white sharks are known to be the largest extant predatory fish and also one of the most deadliest. The Largest females of the species can reach 6.40 meters and weights of 1,905 kg while they usually reach 3.4-4m for the smaller males and 4.6 to 4.9 meters for the females on average. They are at the top of marine food chain with only killer whales posing a threat to adult great white sharks. The Killer Whale primarily preys on marine mammals but its other prey may also include large fish, seabirds and sea turtles. Whale carcasses are also thought to be a major part of their diet. Large prey species such as the elephant seals, dolphins and porpoises are usually killed by a large bite and leaving the prey to bleed to death while smaller seals are ambushed from below .
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Great white sharks are apex predators of their environment though there have been cases of juveniles killed by killer whales or Orcas. Killer Whales usually kill the sharks by ramming the sharks multiple times. Both the predators compete with each other where their prey species overlap. The tiger sharks are also known to reach large sizes but occupy a different niche but competes with the great shark for carrion both the shark have been observed feeding on the whales carcasses together. In Australia, Saltwater Crocodiles also occur in marine environment but rarely interact with the large sharks. During the Neogene, it is thought that the Great White Shark was descended from its ancestor, Cosmopolitodus Hastalis(An 8-9 meter, ancient shark with a narrow body form that coexisted with the colossal shark, O. Megalodon. Known formerly as the “Broad-Tooth Mako/White Shark, it had a worldwide range, from North America, to Libya, The Netherlands, Australia, New Zealand, Greece, Chile, Japan, Malta, Portugal and even Peru). The ancient Great white shark relatives themselves during this time seems to avoid the larger Otodontid Sharks by prefering cooler water reaching their current global distrubution after the extinction of Megalodon and the other Otodontid Sharks.