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Sudan is already old for his species and probably doesn’t have much time left. Meanwhile, conservationists are searching for new ways to preserve his lineage, including in vitro fertilization and stem-cell technology.

Why Is This Rhino on Tinder?

The Yangtze giant softshell turtle

The last breeding pair of Yangtze giant softshell turtles, the largest freshwater turtles in the world, are 110-year-old Susu and 90-year-old Xiangxiang in China. Also known as Red River turtles, there may be a few more alive in the wilds of China or Vietnam, but otherwise these two are it. Imagine being 100 years old and having to produce offspring? Yeah, sounds hard. Scientists have been trying for a decade to get the pair to mate successfully, but it’s looking like artificial insemination might be only remaining option.

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Even though turtles have long been significant in Chinese culture, that hasn’t stopped development—including massive hydropower dams—and population growth from pushing these cherished turtles to the brink of extinction. While the Yangtze turtle is caught in especially dire straits, nearly all species of marine turtles are threatened. On top of all the habitat degradation, their eggs, meat, and skin make them appealing to poachers.

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Mutant marbled crayfish: no male, no cry

Ever wish you were part of an all-female species that could reproduce on its own and rapidly take over the world? Well, a new variety of crayfish is living out your dreams if so.

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A recent study found the six-inch-long, ten-legged marbled crayfish to be one of the most remarkable species known to science; and that its amazingness is allowing it to multiply rapidly and invade ecosystems across the world.

As the BBC reports, the original mutant crayfish, born to a male and female slough crayfish, had an additional set of chromosomes that allowed it to reproduce without a mate. Fast-forward a couple decades and the crayfish—now officially deemed its own species—has been found in the wild in Japan, Madagascar, the U.S., and multiple European countries.

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In fact, the crayfish is now threatening indigenous species, and the European Union and several U.S. states have already banned it from being owned or traded.

Sounds like the marbled crayfish is truly thriving at being single.