A Galapagos tortoise with an abnormal sex drive saved his species from the brink of extinction. Diego the tortoise, who is 100 years old, is retiring to his home on Espanola Island in Ecuador after spending more than 40 years in a breeding program. Wildlife experts determined that the program was a success thanks to Diego and his rampant mating, raising his species’ population in the Galapagos from 15 to 2,000