A large saltwater crocodile shows aggression as a boat passes by on the Adelaide river 60 kilometers (35 miles) from Darwin in Australia’s Northern Territory, Saturday, Oct. 15, 2005. Crocodiles are a large very aggressive carnivore with adult males reaching sizes of up to 6 or 7 meters (20 to 23 feet), and females being smaller at 2.5 to 3 meters (8 to 10 feet). These ancestors of the long extinct dinosaurs are a territorial animal that have been known to attack small boats and killing people.(AP Photo/Rob Griffith)
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