Of the thousands of rivers, creeks, lakes and billabongs in Australia a small percentage are inhabited by the two species of crocodile (croc) that live here and all are restricted to the very northern tropical regions of the country.
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Look for safety signs and do not swim in rivers, estuaries, mangrove shores or deep pools. Always seek local advice in your area about crocodiles before boating, fishing and camping.
The Mary River in the Northern Territory has 15 crocodiles per km, making it the most densely populated river! The temperature of the egg determines the sex of the animal.
Swimming during the day already carries the danger of rips, tides and unexpected changes, but swimming at night carries those risks and more. The lack of vision, the lack of assistance and the added emotional stress of being pulled into darkness places some truly difficult hurdles for swimmers to overcome.
The species usually does not attack people as regularly as Old World crocodiles do; the estimated number of attacks is considerably smaller than those by the saltwater (C. porosus) and Nile crocodiles (C. niloticus), which are considered the most aggressive crocodilians towards humans.