Unlike most mammals, this species isn’t covered in fur - it’s covered in keratin scales that act like built-in body armor.

Janson, C. and Emmons, Louise H. 1990. "Ecological structure of the non-flying mammal community at Cocha Cashu Biological Station, Manu National Park, Peru." In Four ...

Newly discovered fossils, belonging to the mammal-precursor species Brasilodon quadrangularis and Riograndia guaibensis, offer critical insights into the development of the mammalian jaw and middle ...