[Junior]

If the critter was two-legged to begin with, it does make sense...

[AndrewC]

If the critter was two-legged to begin with, it does make sense...

I challenge you to a scamper up a 60 degree slope. You run and flap your arms. I, being two-legged, will use my arms and hands to assist my running ascent. Guess who will get higher, faster.

Now, strap on big fans on all our arms and put mittens on our hands. Running the same race and using the same techniques who will get higher, faster?