The world’s rarest turtle has moved a step closer to extinction after a female specimen died in a Chinese zoo, leaving behind just three known members of the species. The Yangtze giant softshell turtle, believed to be above 90 years of age, died in Suzhou Zoo on Saturday, according to the Suzhou Daily. Its death came a day after zoo officials made a last-ditch effort at artificial insemination using semen from a male companion estimated to be more than 100 years old, according to the Suzhou Daily. The zoo tried unsuccessfully for several years to get the pair to mate and reproduce naturally.