Learning crowd system with thinkingParticles. With this tP tools, you can select any geometry, specify number of spiders to be generate. The spiders will walk on any surface. The setup was very simple. There are 1)no Particle repulsion 2)no collision detection 3)and only have single walkcycle no other states ie: idle, attack... 4)can't change walkcycle play speed according to particle speed.
I will add those features in the future ; )