Although they look the same size on this coin, they are not. The smaller one is the New Guinea crocodile (Crocodylus novaguinae), with males growing up to 3.5 m in length.
The other one is the Saltwater Crocodile (Crocodylus porosus), the largest living reptile on earth. Mature males typically measure 4 to 5.5 metres long and weigh 600 to 1,000 kg, although they can reach sizes of 6 metres or greater (that's 20 feet), and over 1,300 kilograms (almost 1.5 tons). Holy croc!
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