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Q: This hero tortoise saved his species from extinction by fathering 800+ offspring 
  
 Diego, a tortoise of the endangered Chelonoidis hoodensis subspecies from Española Island, is seen in a breeding centre at the Galapagos National Park on Santa Cruz Island in the Galapagos archipelago, located some 1,000 km off Ecuador's coast, on September 10, 2016. / AFP / RODRIGO BUENDIA (Photo credit should read RODRIGO BUENDIA/AFP/Getty Images) less Diego, a tortoise of the endangered Chelonoidis hoodensis subspecies from Española Island, is seen in a breeding centre at the Galapagos National Park on Santa Cruz Island in the Galapagos archipelago, located ... more Photo: RODRIGO BUENDIA/AFP/Getty Images Photo: RODRIGO BUENDIA/AFP/Getty Images Image 1 of / 9 Caption Close This hero tortoise saved his species from extinction by fathering 800+ offspring 1 / 9 Back to Gallery 
  
 In what is being heralded as a heroic act, a single Galapagos giant tortoise has helped save his species from extinction by fathering more than 800 offspring. 
  
 Diego is a Galapagos giant tortoise who was given a very important task — he was chosen as the male dominant to repopulate his species on Espanola Island, which is part of the Galapagos Islands. About 50 years ago, before Diego came to the island, only two male and 12 female Galapagos giant tortoises existed, according to a news release from AFP. 
  
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 Diego, who is at least 100-years-old, clocks in at 175 pounds, is 35 inches long, and if he stretches hard enough, he’s about 5-feet-tall. 
  
 He lives at a center for tortoise breeding on Santa Cruz Island, one of the largest islands in the Galapagos. In his enclosure, there are six female tortoises who are Diego’s partners in the noble quest to save their species. 
  
 “He’s a very sexually active male reproducer,” said Washington Tapia, a tortoise preservation specialist at Galapagos National Park, in the release. “He’s contributing enormously to repopulating the island.” 
  
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 Four years ago, a genetic study found Diego was the father of “nearly 40 percent of the offspring released into the wild on Espanola,” Tapia said. 
  
 Giant tortoises, who spend 16 hours a day resting, mate mostly from January to May, the hotter months of the year, according to the Galapagos Conservancy. A female giant tortoise can lay one to four nests during the season from June to December. The number of eggs in a nest can range from two to seven for saddle-backed tortoises and 20 to 25 eggs for domed tortoises, according to the Conservancy. 
  
 It takes 110-175 days for the eggs to incubate and hatch. 
  
 When mating, female giant tortoises are silent while the males make a sound similar to that of a cow's "moo," according to the Conservancy. Other than that, most communication between giant tortoises is behavioral. 
  
 When displaying dominance, the tortoises will face each other with their mouths open and stretch their necks as high as possible. The one who gets their neck the highest "wins," according to the Conservancy. 
  
 Diego has been in the captive breeding program since 1976 when he was brought back home from the San Diego Zoo. He is thought to have been taken from his island between 1900 and 1959. 
  
 Three of the 15 species of giant tortoise originating in the Galapagos have gone extinct. 
  
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 Before Diego, there was a tortoise named Lonesome George who was tasked with breeding to save the species. He died in 2012 at more than 100-years-old after years of refusing to breed in captivity. 
  
 Now, Tapia said specialists believe there are some 5,000 Galapagos giant tortoises inhabiting the islands. 
  
 “It’s a population that’s in pretty good shape, and growing, which is the most important,” Tapia said. 
  
 kbradshaw@express-news.net 
  
 Twitter: @kbrad5 ||||| Diego, a tortoise of the endangered Chelonoidis hoodensis subspecies from Española Island, is seen in a breeding centre at Galapagos National Park, Ecuador on September 10, 2016 He's over 100 years old, but his sex life is the stuff of legend. Diego the Tortoise is quite the ladies' man, and his exploits have helped save his species from extinction. 
  
 Diego, a Galapagos giant tortoise, has fathered an estimated 800 offspring, almost single-handedly rebuilding the species' population on their native island, Espanola, the southernmost in the Galapagos Archipelago. 
  
 "He's a very sexually active male reproducer. He's contributed enormously to repopulating the island," said Washington Tapia, a tortoise preservation specialist at Galapagos National Park. 
  
 Diego is a Chelonoidis hoodensis, a species found in the wild only on Espanola. 
  
 The island is one of the oldest in the Galapagos, the Pacific archipelago made famous by Charles Darwin's studies of its breathtaking biodiversity. 
  
 Around 50 years ago, there were only two males and 12 females of Diego's species alive on Espanola, and they were too spread out to reproduce. 
  
 He has done more than any other tortoise to turn that around—with the help of his mates, of course. 
  
 Diego lives at a tortoise breeding center on Santa Cruz Island, one of the largest in the Galapagos. 
  
 He is the dominant male of the three assigned to repopulate Espanola. 
  
 Galapagos giant tortoises 
  
 He shares his enclosure with six females, his partners in the task of saving their species. 
  
 Tough work, but some tortoise has to do it. 
  
 Mysterious Casanova 
  
 On a cloudy morning with chilly wind, Diego timidly peeks his head out from his thick shell, then slowly plods toward some leaves for breakfast. 
  
 "Look, look! He came out. How pretty," said a young girl as she looked on. 
  
 Diego weighs about 80 kilograms (175 pounds), is nearly 90 centimeters (35 inches) long and 1.5 meters (five feet) tall if he really stretches his legs and neck. 
  
 He has a mysterious, globe-trotting background to go with his reputation as a Casanova. 
  
 Of the 15 species of giant tortoise known to have originated in the Galapagos, three have gone extinct—victims of 18th-century pirates who plundered the islands' fragile ecosystem 
  
 Diego was found at the San Diego Zoo—hence his name—after Chelonoidis hoodensis was identified as a species and an international campaign was launched to find more of the rare tortoises. 
  
 "We don't know exactly how or when he arrived in the United States. He must have been taken from Espanola sometime between 1900 and 1959 by a scientific expedition," said Tapia. 
  
 After being located at the zoo in California, Diego was brought back to the Galapagos in 1976 and put in the captive breeding program. 
  
 The 40% dad 
  
 Little did scientists realize just how effective he was, until six years ago. 
  
 "We did a genetic study and we discovered that he was the father of nearly 40 percent of the offspring released into the wild on Espanola," Tapia told AFP. 
  
 In all, around 2,000 tortoises have been released on the small island. Thanks to the program, the species is no longer facing extinction. 
  
 Diego, a Galapagos giant tortoise, has fathered an estimated 800 offspring, almost single-handedly rebuilding the species' population on their native island, Espanola 
  
 "I wouldn't say (the species) is in perfect health, because historical records show there probably used to be more than 5,000 tortoises on the island. But it's a population that's in pretty good shape—and growing, which is the most important," said Tapia. 
  
 Of the 15 species of giant tortoise known to have originated in the Galapagos, three have gone extinct—victims of 18th-century pirates who plundered the islands' fragile ecosystem. 
  
 Diego's species has also been introduced on the island of Santa Fe, where a genetically similar one, Chelonoidis spp, disappeared more than 150 years ago. 
  
 Not all critically endangered tortoises rise to the challenge as Diego has. 
  
 Hopes for another threatened species, Chelonoidis abingdoni, faded when its last known survivor died in 2012 at more than 100 years old. 
  
 Known as Lonesome George, he had refused for years to breed in captivity. 
  
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A:
The most tireless and passionate proponent of saving the Galapagos tortoise from extinction is ancient, lecherous, and not particularly attractive, but those attributes are apparently a big hit with the ladies. Gentle reader, meet Diego, the lusty 100-plus-year-old tortoise who has helped bring his kind back from the brink of extinction—by having copious amounts of sex with any female in sight, reports the AFP. "He’s a very sexually active male reproducer," says Washington Tapia, an actual tortoise preservation specialist at Galapagos National Park. "He’s contributing enormously to repopulating the island." How enormously? Diego is babydaddy to an estimated 800 offspring, or to better put it, a genetic test four years ago showed "that he was the father of nearly 40% of the offspring released into the wild on Espanola," the tortoises' native island. Diego is a globe-trotting charmer, taking his name from the San Diego Zoo, where Tapia says he was taken "sometime between 1900 and 1959 by a scientific expedition." He was returned to the Galapagos Islands in 1976 to get down to work in a captive breeding program, as his kind had at one point dwindled to two males and 12 females on Espanola. Diego, it turns out, takes his job seriously. "Tough work, but some tortoise has to do it," the AFP snarks, while the Houston Chronicle runs through a primer on tortoise mating that includes the tidbit that "female giant tortoises are silent while the males make a sound similar to that of a cow's 'moo.'" Today, at least 2,000 tortoises have been released into the wild. “It’s a population that’s in pretty good shape, and growing, which is the most important,” Tapia says. (More on the Galapagos tortoises' fight back from the brink here.)