Seen here, the sea type of this has the thickest fur of any animal, with more than one million hairs per square inch
Here 
at the aquarium, our sea otters enjoy a restaurant-quality diet of gulf shrimp,... [DOC] [TLE] A Mammal Like No Otter  ZOONOOZ [PAR] HEADER HERE Clockwise from left: The otters in Ituri Forest at the Zoo are ... to 
feed their rapid metabolism, and they have the densest fur of any creature on the 
planet.