Marty (wingedelephant) elaborated, "It's not just the ungainliness, with the big body and long legs, and how you kinda amble like a moose. It's also the air of being slightly absurd yet slightly dignified (albeit somewhat unkempt) and the unsocial-yet-amiable quality, how they are basically pacifistic and mostly like to wander alone in the woods, but will tolerate you visiting if you're pleasant, come visiting in your yard if it seems interesting, and kick your ass if provoked. Also the thoughtful way they stand around and chew while dreamily thinking deep thoughts. It's true that Ron didn't pick moose, but cops to the mooseness thrust upon him."
So, now you know.