sharks are mainly benthic in nature, cruising along the sea floor and making an occasional foray to the surface. Behavior An opportunistic predator, the broadnose sevengill preys on a great variety of animals and has been found at a depth of in offshore waters. It has been found to feed on sharks (including gummy shark, one of its main prey, and cowsharks), rays, chimaeras, cetaceans, pinnipeds, bony fishes and carrion and will also feed on whatever it finds such as shark egg cases, sea snails and remains of rats and humans. Research in 2003 found that its diet consisted of 30% mammals with a frequency of occurrence of 35%. It is a frequent top predator in shallow waters and has comb-like teeth, with the upper teeth having slender, smooth edged cusps to swallow small enough prey whole and lower teeth broad enough to bite prey to pieces. These sharks occasionally hunt in packs to take down larger prey, using tactics such as stealth to succeed. After feeding, it slowly digests the food for several hours and days and can go weeks until eating again. Large predatory sharks such as the great white shark can be a threat and cannibalism among this shark has also been recorded. The species have also been observed being preyed upon by Orcas in False Bay on the South African coast. When not highly active, it hunts stealthily while making very little movement except for moving its caudal fin until dashing to strike. It can be one of the most abundant predators in coastal waters in summer and, in southeast Tasmania, there is a high abundance of elasmobranches including the gummy shark in coastal regions in summer. In New Zealand, it is also one of the most common inshore sharks. While it is mainly a nocturnal forager, it may opportunistically feed on prey casually found during the day, however, research in 2010, found even amounts of activity during day and night. During this research, this shark was consistently detected at all depths from bottom to near surface whereas it was the substrate during the day. It also found that as Norfolk Bay does not have adequate shelter cover, this species may use group formation to avoid predation. This sevengill, like all other members of Hexanchiformes, is ovoviviparous. The broadnose sevengill lives for about 30 years although the Washington Department of Fish and Wildlife in Washington state