The Port Jackson Shark (Heterodontus portusjacksoni) is a nocturnal, oviparous type of bullhead shark of the family Heterodontidae, found in the coastal region of southern Australia, including the waters off Port Jackson. Adults can grow up to 5.5 ft long and weigh up to 60 lbs. This species is found in depths from 100 to 275 m. The preferred habitat is rocky, sandy or muddy substrates on or near the ocean bottom, and also areas where sea-grass grows. During the day, it often rests in the protected shelter of caves and crevices of rocky areas.