Percy writes:
Here's an interesting fact - the koala bear's pouch is also inverted. So much for the connection
with burrowing.
An animal that climbs trees with it's belly dragging across the surface of the tree arguably has much the same reasons for an inverted pouch as a burrowing animal.
Or koalas are descended from burrowing animals and evolution was incapable of inverting a fully formed pouch?
The inverted pouch question is more interesting than it first appears.........