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Friday, May 10, 2013 - 8:00 PM    "The Cold Blooded Truth" In the Galapagos Islands, thermal imagery reveals how marine iguanas accumulate power for sea diving by basking in the sun. Female side-blotched lizards in California choose mates from among males who have claimed the hottest rocks. Saltwater crocodiles, the ultimate cold-blooded killers, conduct tender courtships. Part 1 of 5 G

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