As I recall - aren't the "Nurse sharks" of Australia known as Grey Nurses - which would be the same animal that we in the southeastern U.S. call Sand Tigers. Our(American) Nurse Sharks (Ginglymostoma cirratum) aren't found in Australia or the Indo-pacific area. The closest related shark to our Nurse that is found near Australia is the Tawny Nurse (Nebrius ferrugineus), which is a slightly larger species.