Weather alert question

They're an invasive species with no cold adaptation whatsoever. They've exploited an unpopulated niche in South Florida as arboreal herbivores. Most tropical ecosystems have primates or sloths in this role, but in Florida they have iguanas. So their populations have exploded. Problem is when Florida gets cold they go immobile. If they're in a tree they crash to the ground.

Once it warms up they wake up and return to whatever it is there were doing, or more likely not doing.
 
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