Meet the 'sabre-toothed sausage'
The naked mole rat is one of the world's strangest mammals.
Found in East Africa, the small rodents have been compared to insects. They live in huge colonies, with a single female - the queen - that breeds with just one or two males. The other mole rats work on maintaining and defending the underground burrows.
The bizarre-looking creatures are also perfectly adapted for living underground, as Dr Chris Faulkes from Queen Mary, University of London explains.