From active to extinct, and at every stage in between, volcanoes hold a strong attraction for sharks of all kinds.
About 290 million years ago -- long before dinosaurs evolved -- lived a four-legged creature sporting a huge sail on its back, fangs, and the first serrated teeth on Earth.
At 13 feet long, it became the first common large predator on land.
Shawn's million dollar Bluff claim is denied, leaving the grounds open to anyone.
Kris Kelly leaps at the opportunity, dragging his family across 70 miles of frozen tundra to what he hopes will be their biggest season yet.
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