Mobile robot designers are increasingly searching for inspirations and design cues from biological models. Biomechanics research of animals provides an invaluable source of ideas for legged robot design but the process of implementation involves great complexity. The direct implementation of biological features and morphology often becomes ineffective and misleads engineers due to various reasons. Firstly, engineers investigate animals to achieve a few particular functions whereas features of animals may serve for multiple functions or often remains unknown. Secondly, the difference between engineering manufacturing process and biological synthesis arouses the difficulties in direct replication. The presentation introduces an abstract bio-inspired design process, which includes simplification of biological inspiration, abstraction of fundamental principles, engineering verification, and prototyping of bio-inspired robots. Introduction of bio-inspired robots exemplify the process: iSprawl, a cockroach-inspired hexapod with compliant, under-actuated legs, runs at 15 body-lengths per second. Spinybot, a hexapod that uses its toes with microspines to climb rough surfaces, including stucco, concrete and brick walls. Stickybot, a gecko-inspired quadruped that climbs smooth vertical surfaces using directional dry adhesion. At the smallest length scale, the undersides of the toes are covered with a unique material called directional polymeric stalks, inspired by the directional setae and lamellae of the gecko. The future direction of the research includes the implementation of the design process to the hyper-dynamic robotics. Hyper-dynamic robotics entails the morphological design and the control architecture for the highly dynamic performance of legged systems. The development of a fast galloping quadruped will be the first challenge in this effort. The research field includes new actuation scheme, robust structure fabrication, and hierarchical control algorithms for complex systems. Extensive studies on biological runners such as dogs and cheetahs will be vital to the morphological design of the a galloping robot capable of the fast traverse on rough and unstructured terrains.