Why would an animal that lives in a cold climate have more unsaturated triacylglycerols in its body fat?

Question

why would an animal that lives in a cold climate have more unsaturated triacylglycerols in its body fat than an animal that lives in a warmer climate?

Answer 1

because

Answer 2

It is probably so that it can build its food source in the fall, and use it in the winter to keep warm (probably while hibernating).  

Answer 3

because unsatd triacylgylcerols or basically unsatd fats dont solidify or freeze easily compared to satd fats even at a very low temperature. it acts like an antifreeze in extremely cold wheather.  as an evolutionary adaptation, those animals should have more unsatd fats.