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In this Oct. 14, 2013 photo, ecology professor Ricardo Freitas catches a broad-snouted caiman to examine, then release back into the water channel in the affluent Recreio dos Bandeirantes suburb of Rio de Janeiro, Brazil. �Caimans are like tanks, a very old species with a remarkable capacity for renovation that allows them to survive under extreme conditions where others couldn�t,� said Freitas, who runs the Instituto Jacare, or the Caiman Institute, which aims to protect the reptiles. �But the fact of the matter is that their days are numbered if things don�t change drastically. (Photo by Felipe Dana/AP Photo)
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