Salto is a single-legged, hopping robot that its UC Berkeley inventors compare to a "hyper-aggressive pogo-stick." Previously, Salto was constrained to a highly-structured indoor environment with a motion caption system. Now though, roboticists Justin Yim and Eric Wang have imbued Salto with the onboard smarts to bounce freely through the world albeit still under human control. From UC Berkeley:
Salto's single, powerful leg is modeled after those of the galago, or Senegalese bush baby. The small, tree-dwelling primate's muscles and tendons store energy in a way that gives the spry creature the ability to string together multiple jumps in a matter of seconds. By linking a series of quick jumps, Salto also can navigate complex terrain — like a pile of debris — that might be impossible to cross without jumping or flying.
"Unlike a grasshopper or cricket that winds up and gives one jump, we're looking at a mechanism where it can jump, jump, jump, jump," (UC Berkeley robotics professor Ronald) Fearing said. "This allows our robot to jump from location to location, which then gives it the ability to temporarily land on surfaces that we might not be able to perch on."
From IEEE Spectrum:
…The researchers expect that "higher precision estimation and control can enable jumping on more finely varied surfaces like stairs, furniture, or other outcroppings" as well as "soft substrates like upholstery or natural foliage."
The researchers tell us that Salto's hardware is capable enough at this point that aside from potentially upgrading the motor or battery for more jumping power or run time, the focus now will be on new behaviors, although they're toying with the idea of adding some kind of gripping foot so that Salto can launch from, and land on, tree branches (!).