Sharks and crocodiles are ambush predators and opportunistic feeders. There are many types of sharks around Australia; most pose little threat to humans. Freshwater and estuarine crocodiles are known to inhabit the tidal areas and inland waterways of northern Australia.
Safety advice and risk management regarding sharks and crocodiles aim to avoid encounters with these marine creatures. As a lifesaver you should keep watch for any sign of sharks or crocodiles. You can adopt an elevated surveillance position and wear polarised sunglasses to increase your effective vision over a greater distance. If you are in a region known to have saltwater crocodiles, you should also frequently check for slide marks on the shoreline and maintain surveillance of the water around the red and yellow flags to avoid encounters.