[Sorry, I tried looking for it, but I can't seem to find it.]
Upon closer inspection, the Farfetch'd seemed to have a different morphology from the others of his species. He had a longer body overall, and he wasn't as small as other Farfetch'd; a longer and thinner neck, broad shoulders, a collarbone, wings in the shape of arms with feathers thick and flexible enough to act as fingers, a wide waist and longer, plantigrade legs. A humanoid shape, complete with a defined, sleek musculature.
The Farfetch'd stepped back cautiously after the Ariados approached with twitchy fangs, leek beside his waist.