In fact, a search of pedigrees shows every horse running in the 151st Kentucky Derby is a descendant of Secretariat. While it sounds impressive, more often than not, if you go back six generations in most horses, you'll find they're a descendant of some great, like Secretariat or Northern Dancer.

According to the premier register of thoroughbred horses in the U.S., all of the horses are between four and seven generations of Secretariat.