Wombat Pouch

The opening post assume that the pouch rotated and asked how that could happen with gradual stepwise evolution.You answer that it wasn't the pouch that rotated but the opening that moved from rear to front. How does that happen with gradual stepwise evolution?--Percy

One of us is missing the obvious.--Percy

I see unexplained conundrums no matter which way you turn.--Percy

Here's an interesting fact - the koala bear's pouch is also inverted. So much for the connection
with burrowing.AbE: Tasmanian devil, inverted pouch, burrowing animal.--PercyEdited by Percy, : Add another detail.

I think you've got the answer.The way I've been looking at this is by imagining the pouch as a four-sided flap of skin attached on three sides. In the kangaroo the top side of the flap is free, and in the wombat the bottom side. How could which side of the flap is free change gradually over time from top to bottom, or vice-versa if bottom-side-free came first. Seems impossible.But that's the wrong way to look at it. The pouch is actually a flap of skin attached on four sides with an opening. In kangaroos the opening is at the top, in wombats at the bottom. Whichever direction the change occurred, it happened through a gradual change in the position of the pouch opening.--PercyEdited by Percy, : Grammar.