From Wired Science here.
Persobal favourites are the ones that look like lady bugs or ants or bark or the end of a tree stump:
Myrmarachne is a great word. It aptly describes what this spider is doing: making itself look like a red weaver ant. In fact, the spider is so successful in its disguise that when Bay is out taking pictures of the species, people often ask him why he’s photographing a common ant.
Natural selection explains it all, of course, via a gradual transformation in countless successive generations of the spider over time. Right?
Looking 5% like an ant is exactly what a spider needs for the perfect disguise during the critical first few generations!
It’s just as good as like looking 5% like a cop would be. 😉