michaelbirti Black and Archer, 1997 Silvabestius is an extinct genus of marsupial dating to the Early Miocene.

This animal is known from two skulls found close together which have come to be known as the "Madonna and Child" fossils.

It was a herbivore which browsed on soft plant matter such as leaves and stems and lived in an environment that largely consisted of tropical rainforest.

Silvabestius is in the family Diprotodontidae and is therefore related to the extinct giant marsupial Diprotodon as well as to living koalas and wombats.

Two well preserved Silvabestius skulls were found close together, believed to be from a mother and child, in Riversleigh, Queensland, Australia.