This was a fascinating article to read. I have always thought of otters being small, little fur-balls in the water. The North American Otter today is under 4 feet and roughly 11-30 pounds. Learning that they were the size of wolves was interesting because I wonder what caused them to lose their large physiques over time. Maybe the largeness of their jaws created a hindrance on eating small mollusks or other shell fish, like otters do today. Another possibility of why the present otter is smaller, could be related to the swiftness and agility the otter has, compared to the bulkiness of its past size. Natural selection must have played a role in keeping the smaller-sized generations of otters because they were the best of fit.