I've been wondering about this ever since I watched a Mythbusters about the whole "daddy long legs are the most poisonous spider but can't bite people" myth. I always thought the round one was a DLL (don't make me type it again!) because of their body structure being unlike a spider. They used the skinny one. I know for a fact that the skinny ones bite... they've bitten me before! If you google DLL you get BOTH pictures.