The most poisonous animal in the world is not the daddy longlegs. In fact, from a little research, it seems that its not venomous at all. While it is true that their bite is too weak to penetrate human skin, the statement that their venom is deadly is false, an urban myth. From what I've read, even if they could penetrate human skin, they have no venom to deliver, although a spider called the cellar spider (which looks a lot like the North American daddy longlegs) is moderately venomous. Still, it does not compare to other venomous animals. The most venomous spider in the world is the funnel web spider of Australia. Phyllobates terriblis, or the Poison-Dart Frog of Columbia, is generally considered to be the most poisonous animal in the world.