The Northern River Shark (Glyphis garricki) is one of the rarest species of shark in the world. It is known only from a small number of locations in Western Australia, the Northern Territory and Papua New Guinea. Discovered in Australia in 1986, only 36 specimens have been recorded here since.
The Northern River Shark is a 2.5-3 metre long shark belonging to a family known aswhaler or requiem sharks. Its closest relative in Australia is the Speartooth Shark, also found in northern rivers and estuaries and listed as Endangered by the IUCN. Distinguishing between the two is difficult, but is based on the location of the “waterline”, the point where the darker upper-body colouring of the shark changes to lighter lower colour.