Animals in North America have a problem — they’re having a hard time moving around.

Migration is key for the survival of a lot of species. But in many places, developments like roads, highways, towns, industrial plants, or even entire cities form roadblocks that limit how far animals can move before they encounter humans in a potentially dangerous way. That's bad news on any day, but especially now that temperatures are on the rise. According to a study from the Proceedings of the National Academy of Science, only 41% of natural lands in the United States are connected enough to allow animals to trek safely toward cold enough habitats.

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Rocky Mountain Wolf Project

The North Pole is famous for many things. 24-hour darkness, polar bears, and of course, being the home of Santa Claus.

One thing it's definitely not known for, though, is balmy, casual, "Hey, how cold is it? Do you think I need a light jacket?" type temperatures.

The north pole is freezing. It's one of the coldest places on Earth. In fact, it's sometimes colder than Mars. Mars!

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