Crocodile smile. Estuarine crocodile / saltwater crocodile / Crocodylus porosus, exhibit at Crocosaurus Cove, in Darwin, Northern Territory, Australia. Crocosaurus Cove displays the world’s largest collection of Australian reptiles. Living up to 80 years, saltwater crocodiles can grow up to 23 feet long and 2,200 pounds. Also known as estuarine crocodiles, they're the world's largest reptile. Previously hunted almost to the point of extinction, in 1971 they became a protected species, ensuring healthy populations today. Crocodiles first appeared 240+ million years ago. The name "crocodile" comes from the Greek word krokodeilos, which means "pebble worm".
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