Batteries add significant weight to robots, and this weight affects the range of movement, maneuverability,
This problem was solved by engineers fromCornell University - they created a 40-centimeter robotic copy of lionfish from molded silicon. Two hydraulic pumps are built into it, each of which works thanks to interconnected flow-zinc batteries.
One pump drives the tail by movingfluid from one part to another, while the other pump pumps fluid stored in the dorsal fins into the corresponding pectoral fins.
While the robot swims rather slowly - at a speed of one and a half body length per minute. However, further development will increase its speed and maneuverability, the authors note.
Earlier, Italian IT engineers have developed a soft robot, which used a plant movement system for training. It can curl like a vine or hunt like a flycatcher!