“Unfortunately for animals, optimization means that while they’re excellent at some things, they struggle with other things, because they’re not able to redesign and re-optimize their skeletons on the fly, because how on earth would that even work, right? But robots suffer no such biological constraints, and roboticists at Colorado State University have developed a small walking robot that can melt and solidify its bones on the fly to optimize its legs for different motions…”

Source: https://spectrum.ieee.org/automaton/robotics/robotics-hardware/robot-melts-its-bones-to-change-how-it-walks