Kangaroos can jump as high as 6 feet in a single jump. Kangaroo legs cannot move independently of one another, which is why they are restricted to a bounding gait. This gait, however, not only allows them to jump high distances, but will also allow them to cover 25 feet in a single leap, and reach speeds of over 35 miles in an hour.
The muscles in a kangaroo's legs function similar to rubber bands. The Achilles tendon is responsible for stretching and releasing the energy that is needed for the forward propelling motion. This unique structure enables the bouncing locomotion.