The obscurus part of the dusky shark’s Latin name translates as ‘dark’ or ‘dim’, and refers to its uniform grey colouration. Duskies are large sharks, capable of exceeding four metres in length; and they are identified by their slender shape and rounded snouts. They are found worldwide in tropical and warm-temperate continental waters, and have been found at depths of up to 400 metres. Although they prefer the outer continental shelf, they sometimes come inshore to hunt. In South Africa, they are regularly seen in coastal waters during the annual Sardine Run. Dusky sharks have a varied diet, preying on anything from bony fish to marine mammals, and have the strongest bite force of any shark. Females are capable of storing sperm for delayed fertilisation.