Now I know this is a porcupine climbing down a tree but its movements can appear a little disturbing, if not intriguing. It almost looks like a person in a porcupine suit.
One rarely gets to see the complete action of a porcupine's legs in the climbing process. You can see the bending from the knee (Photo #3) and the extension of the leg as it gains a foothold (Photo #4).
And of course, just to clarify that this is just a beautiful porcupine carefully descending, see Photo #6. It's amazing how a different perspective gives an entirely different look. :)