Willo, scientific name Thescelosaurus, is the best preserved dinosaur for its species. It has a complete skull and soft tissues which are usually lost to decay. The creature, an herbivore, was about three feet tall at the hip, weighed some six hundred pounds, and was twelve to thirteen feet long. What makes Willo unique was that its discovery revealed something that was considered undiscoverable--a fossilized organ--in this case a dinosaur heart. Friends of the North Carolina Museum of Natural Sciences purchased Willo for $350,000, but it is estimated now to be worth ten times that because of the heart discovery.