Long-lived mole rats
It makes sense that if you want to live on the relentlessly hot African savannah, then you’re going to need some specialised skin adaptations. But if you live under it, your skin still needs to be pretty special. Naked mole rats have incredibly loose skin, which prevents snagging on roots and sharp rocks. It contains a compound called hyaluronan (known more familiarly as hyaluronic acid), which not only makes the skin nice and stretchy but drastically reduces the incidence of cancer in these little rodents: they can live up to 10 times longer than other, similar-sized rodents. Researchers are exploring how these nearly hairless mammals may help us to understand ageing and disease resistance in humans.