Like a grasshopper, the leaproach powers its mighty jump with a huge pair of back legs that are twice the length of its other four, and longer than its entire body. The legs have other grasshopper-like features. Thier femur (the part closest to the torso) has a groove that the adjoining segment (the tibia) can tuck into, allowing the leg to flex back as far as possible before a jump. And the muscles in femurs are so big that they make up a fifth of the roach’s body weight.