You often hear that art imitates life, but sometimes technology does too. Pliant Energy Systems’ Velox robot resembles an underwater creature more than it does a robot because it uses undulating fins to propel itself, as you can see in the video below.
The video shows the beast skating, but also swimming, and walking. It really does look more like a lifeform than a device. According to the company, the robot has excellent static thrust/watt and is resistant to becoming entangled in plants and other debris.