In this Oct. 14, 2013, ecology professor Ricardo Freitas measures a broad-snouted caiman before releasing it back into the Marapendi Lagoon in Rio de Janeiro, Brazil. While local caimans average about 1.5 meters (4.9 feet) long and weigh about 10 kilograms (22 pounds), older males can be up to twice as long and much heavier. Still, Freitas has been known to dive into the water to catch some with his bare hands. (Photo by Felipe Dana/AP Photo)
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