This undated photo released by Galapagos National Park shows tortoise Diego at Galapagos National Park. Diego is another centenarian reptile, but unlike Lonesome George who was not able to reproduce, Diego has sired hundreds of offspring. Galapagos National Park authorities say it is impossible to know Diego's age, but they believe he is well over 100 and estimate Diego is the father of 40 to 45 percent of the 1,781 tortoises born in the breeding program. (AP Photo/Galapagos National Park)

Associated Press
This undated photo released by Galapagos National Park shows tortoise Diego at Galapagos National Park. Diego is another centenarian reptile, but unlike Lonesome George who was not able to reproduce, Diego has sired hundreds of offspring. Galapagos National Park authorities say it is impossible to know Diego's age, but they believe he is well over 100 and estimate Diego is the father of 40 to 45 percent of the 1,781 tortoises born in the breeding program. (AP Photo/Galapagos National Park)
This undated photo released by Galapagos National Park shows tortoise Diego at Galapagos National Park. Diego is another centenarian reptile, but unlike Lonesome George who was not able to reproduce, Diego has sired hundreds of offspring. Galapagos National Park authorities say it is impossible to know Diego's age, but they believe he is well over 100 and estimate Diego is the father of 40 to 45 percent of the 1,781 tortoises born in the breeding program. (AP Photo/Galapagos National Park)
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