Armadillos are so cool, they're a placental mammal in the order Cingulata, and they have a leathery armour shell.
Sounds cool.  Have you seen one in person?
Armadillo
Armadillos (from Spanish "little armoured one") are New World placental mammals in the order Cingulata. The Chlamyphoridae and Dasypodidae are the only surviving families in the order, which is part of the superorder Xenarthra, along with the anteaters and sloths. Nine extinct genera and 21 extant species of armadillo have been described, some of which are distinguished by the number of bands on their armour. All species are native to the Americas, where they inhabit a variety of different environments. 
Armadillos are characterized by a
"Trichechus manatus" VU
Subclass: Theria Infraclass: Eutheria Superorder: Xenarthra.
Subclass: Theria Infraclass: Eutheria Superorder: Xenarthra Order: Cingulata (armadillos).
Armadillos are small mammals with a bony armored shell. Two of twenty-one extant species are present in Mexico; the remainder are only found in South America, where they originated. Their much larger relatives, the pampatheres and glyptodonts, once lived in North and South America but went extinct following the appearance of humans.
- Family: Dasypodidae (long-nosed armadillos