http://www.wired.com/wiredscience/2009/10/giant-snakes/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wired%2Findex+%28Wired%3A+Index+3+%28Top+Stories+2%29%29&utm_content=Google+Reader
Individual snakes from all nine species have been found in the United States, but so far only three species — Burmese pythons, boa constrictors and northern African pythons — have established breeding populations in the wild, all currently confined to southern Florida. Based on the snakes’ preferred climate range, potential ecological impact and prevalence in trade and commerce, the report classified five species as high risk and the other four as medium risk to native ecosystems.
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