This Category contains articles about all taxa below the subclass/order Monotremata - the platypus, the echidnas, and extinct species which are only known via fossil evidence.

Mammals

Kategori:Kloakdyr | Kategorio:Monotremoj | Catégorie:Monotrème | קטגוריה:בעלי ביב | 분류:단공류 | Category:Monotremi | Flokkur:Nefdýr | Kategori:Kloakkdyr | Kategoria:Stekowce | Категория:Однопроходные