The ability for motion is common to all living beings being essential for their survival. Most animals and humans use muscles for movements. Examples of artificial muscles are dielectric elastomer actuators (DEAs) with their voltage induced deformation. However, the required driving voltages are quite large, often in the kilovolt range. Quite unnoticed, plants are also capable of motion. In contrast to animals they don?t use muscles. Instead they employ very soft actuation based on swelling and shrinking or elastic instabilities. Inspired by plants and fungi we have built hydraulic actuators. Here an elastomeric frame undergoes large deformations caused by the phase transition of an embedded liquid from the liquid to the gaseous state. The phase transition in the liquid is simply induced by electrical Joule heating. A very large deformation is feasible on the base of the huge volume changes upon the liquid gaseous phase transition. Low voltage operation is guaranteed, since the deformation relies on liquid heating, albeit with large power consumption in comparison to DEA?s. Biaxial deformations of ~100% are achieved in a 9 mm wide cell within a PDMS elastomer at a driving voltage of 10V and an input power of 1W, with a large blocking force of 5-6 N. The proposed actuator concept is easily prone to miniaturization, potentially useful in Braille readers.