Armadillo -
http://www.everwonder.com/david/armadillo/facts.html
Armadillo Facts
• Armadillos always give birth to four identical young -- the only mammal known to do so. All four young develop from the same egg -- and they even share the same placenta!
This is basicly cloning
• Armadillos are used in leprosy research because their body temperatures are low enough for them to contract the most virulent form of the disease. Some female armadillos being used for research have given birth to young long after they were captured -- up to two years afterwards, in some cases! These "virgin births" are a result of the female's ability to delay implantation of the fertilized egg during times of stress. This reproductive tactic is one reason why the 'dillos are so good at colonizing new areas (such as the United States!).
• Armadillos like to swim, and they are very good at it. They have a strong dog paddle, and can even go quite a distance underwater, walking along the bottom of streams and ponds. When they need to float, they gulp air into their intestines to make them more buoyant.
The bullet came from the water!
• Armadillos have a very low metabolic rate, which means they don't waste a lot of energy producing heat. This also means that they are not good at living in cold areas, because they can't keep warm very well! They do not have any fat reserves, so they must forage for food on a daily basis. Just a few cold days in a row can be deadly to a 'dillo. One way they conserve energy is through reta mirabila (Latin for "miraculous net")-- a system of veins and arteries in their legs. Hot blood going out through arteries is cooled by cold blood coming in through veins, and vice versa. This means that not much heat actually goes out into the legs, keeping it in the body. This also means they will get frostbitten very easily, since they have no way to warm their extremities through blood flow.
Invisible to heat vision?
• Baby armadillos have soft shells, like human fingernails. They get harder as the animal grows, depositing bone under the skin to make a solid shell.