I agree with ya Bilbo about the platypus duck thing...

If it works why change it? Four fingers and a thumb was a brilliant idea so He used it a few times.

One more thing...

When I was young they used to say that humans did not need the pinky finger. I was told (in science class) that it would continue to grow smaller from lack of use and eventually baboes would be born without them. I'm 31 years old now and never seen a pinkiless baby that the doctors didn't call deformed. Seriously.