Jason Head at the University of Toronto, Canada, and colleagues dug up the 60-million-year-old relative of the boa constrictor in a Colombian coal mine (Nature, DOI: 10.1038/nature07671). Temperature can affect body size, and for the snake to grow to 13 metres long and weigh over 1 tonne, the tropics would have to have been at about 33 °C, 7 °C warmer than today's average.
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