In this Oct. 14, 2013 photo, ecology professor Ricardo Freitas and his crew search for broad-snouted caimans in the Marapendi Lagoon in Rio de Janeiro, Brazil. Some of the animals have taken refuge in ponds being built inside the Olympic golf course, which abuts a once pristine mangrove-filled lagoon that�s now thick with tons of raw sewage pumped from nearby high-end condominiums. (Photo by Felipe Dana/AP Photo)
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