Last year, in the journal quoted below, he attempted to prove the descent of the modern elephant, through Pyrotherium and certain other forms, from a primitive opossum (Proteodidelphys).

Meet the tiny Patagonian monito that is a ‘living fossil’ from the ancient past ... such as opossums, that live in the Americas – something that’s long puzzled scientists.

Some of the animals on display at Pa. Zoo Day include African penguins, Virginia Opossum, Flemish giant rabbit, ball python, macaws and a Patagonian cavy.