There are so few wild ocelots in the US that the cats are becoming inbred, with a bad prognosis for their ultimate survival. But researchers are perfecting ways to get new genes into the population.
Female moles evolved to have high testosterone levels, making them fiercer diggers and mothers. Female hyenas share this trait, but it means they must give birth through a male-like phallus.
Conservationists are increasingly looking to translocating rhinos. This not only ensures their safety but also enables improvements to their genetic health.