The crested horn shark, which looks almost identical to the Port Jackson shark, is a major predator of Port Jackson shark eggs. They crush the eggs using their strong jaws, feeding off the rich yolk.

In what was the fourth attack off the WA coast in just over a fortnight, the male swimmer was bitten on the foot by a 1.5m tiger shark at the Sandtrax surfing spot at Port Beach about 2.30pm on ...