If you have ever watched Kim Possible with your kids or by yourself (admit it), you’re already familiar with this mammal. The naked mole rat looks quite unique and does, in fact, possess uncommon characteristics. Most notably, this inverted-looking rodent is the only mammalian thermo conformer, which means it adapts to the surrounding temperature as its own body temperature. It is also resistant to cancer and can live for very long. They typically grow to up to 4 inches and can weigh about 50 grams.