This is a recent obit from The Economist magazine.
Though he was probably the last surviving example of the giant Galápagos tortoise Chelonoidis nigra abingdonii, he too refused to perform. Scientists, tourists, journalists, conservationists and the government of Ecuador all waited for two decades for him to mate successfully or, indeed, get it on at all. He wasn't playing. In 1993 two females of a slightly different subspecies were put into his corral. He ignored them. When at last he decided to do his duty, in 2008 and occasionally later, the eggs failed to hatch. Clearly, he was a slow burner. . . . He refused to be turned on even when a female Swiss zoology graduate, smeared with tortoise hormones, gave him manual stimulation for four months.That could be me! Where's my hot Swiss miss grad student?