This study investigated the locomotion mechanism of foxtail robots. focusing on the frictional anisotropy of tilted bristles under the same friction coefficient and propulsion strategy using bristle diversity. Through dynamic analysis and simulations. we confirmed the frictional anisotropy of tilted bristles and elucidated the role of bristle diversity in generating propulsive force. https://fitnessgravesyardes.shop/product-category/plastic-plate/