Yangtze giant softshell turtle
The Yangtze giant softshell turtle is the largest freshwater turtle in the world. Unfortunately, it is also the world's rarest. Only three specimens are known to exist in the world after a fourth one died in Vietnam in January 2016. Of the remaining three, one lives in a Vietnam lake and two others reside at Suzhou Zoo in China. Only one is female, meaning that the survival of the species rests entirely on her capacity to breed.
Luckily, the female is one of the two specimens living at the Suzhou Zoo, and she has successfully mated with the resident male. However, she's 100 years old, and so far there's no sign of motherhood for the centenarian turtle. Scientists are working to improve conditions at the enclosure to improve the odds that a brood will survive.
The species was once widespread throughout the Yangtze River network in China, but eventually fell victim to widespread pollution, development and hunting.