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If you happen to be in Florida during a cold spell, don't look up. You could get a face full of iguana. If you don't like the cold, iguanas like it even less. The cold blooded reptiles are native to warm countries like Mexico, Central and South America, and the Caribbean, and they have a special mechanism for conserving energy when it gets too cold: freeze and drop.
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When temperatures drop to 40 degrees Fahrenheit or less in Florida, things start to get weird. And by weird, we mean iguanas metabolisms slow down so much that their bodies stop working, freeze up, and they fall out of whatever tree they are perched in. The iguanas are far from dead; it's more like stasis or running low on battery. Animals that rely on external temperatures to regulate their own body temperatures are called ectothermic.
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Like frozen pizza, the iguanas will be OK once they start to thaw out in sunshine or warmer weather. But unlike frozen pizza, do not eat the iguanas once they have defrosted.