Thousands of caimans thrive in Rio's urban sprawl

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Brazil Rio Caimans
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Brazil Rio Caimans
In this Oct. 14, 2013 photo, ecology professor Ricardo Freitas holds onto to a broad-snouted caiman he caught to examine, then release back into the water channel in the affluent Recreio dos Bandeirantes suburb of Rio de Janeiro, Brazil. With a population that’s 85 percent male, a serious demographic problem is looming for Rio’s caimans, said Freitas, who suspects that the uncontrolled release of raw sewage is behind the gender imbalance. Organic matter raises water warmer and among caimans, high temperatures during a certain stage of incubation result in male offspring. (AP Photo/Felipe Dana)