Cold Weather Survival: Homeothermic or Heterothermic
Which will survive better in cold weather, a warm or cold
A warm blooded creature will be able to generate its own heat
and will be able to function in cold weather.
A cold blooded creature will go dormant in cold weather and will
lost its functionality in cold weather.
So I would say that warm blooded creatures can better survive cold
The contemporary example are the pet pythons that were released in
the Florida Everglades by their owners that are now dropping dead
because of the cold weather down there this year.
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Update: June 2012