ɹˈiːsəntli, mˈoːɹ ɐdvˈænst hˈɑːpɪŋ ɹˈoʊbɑːts hɐvbɪn dɪvˈɛləpt baɪ ɹᵻsˈɜːtʃɚz æt ðə dᵻpˈɑːɹtmənt ʌv ˈɛnɚdʒiz sˈændiə nˈæʃənəl lˈæbɹətˌɔːɹiz, hˌuː hæv jˈuːzd pˈɪstən sˈɪstəmz tə mˌeɪk dʒˈʌmps æz hˈaɪ æz twˈɛnti fˈiːt ɪnðɪ ˈɛɹ.
Recently, more advanced hopping robots have been developed by researchers at the Department of Energy's Sandia National Laboratories, who have used piston systems to make jumps as high as 20 feet in the air.