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18 Divers went up to South West Rocks ro dive with South West Rocks Dive Centre at Fish Rock. The cave is also intersting to go through, finding interesting critters. However, the Grey Nurse sharks (also known as Sand Tiger) are the main attraction. The east coast population is listed as critically endangered.
Sharks have to move to keep water flowing over their gills and supoly them oxygen. During the day there are sleeping. Sharks do not have eyelids and so cannot 'close their eyes' to sleep. Dusk and night is the common time for eating.