Reminds me of a time I was fishing in the evening, it was almost dark. I saw a "v" swimming across the pond, so i threw my buzzbait in front of it and started to retreive. Turns out it was a nutria, and it swam onto the bank and started running to me. I Think i broke some sort of speed record, and ran onto the street and called my mom for a ride home. Nutrias are like beavers, but have huge teeth and can attack people.
http://www.animalcapture.com/images/nutria_front.JPG