Naked mole rats have the worst sperm in the animal kingdom

Often called "sabre tooth sausages," naked mole rats are among the most bizarre members of the rodent realm. They live for 20 years — an enormous amount of time compared to other rodents — and exist entirely within a network of underground tunnels. They are blind, feel no pain on the surface of their skins, can run… » 12/05/11 1:00pm 12/05/11 1:00pm