AquaJelly is an artificial jellyfish made by Festo and presented at the Hannover Trade Fair in 2008. It is an autonomous jellyfish with an electric drive and an intelligent, adaptive mechanical system. It has 11 infrared light-emitting diodes and communicates with a central station by using the short-range radio standard ZigBee. AquaJelly consists of a translucent hemisphere and eight tentacles used for propulsion. At the centre of the AquaJelly is a watertight, laser-sintered pressure vessel. This comprises a central, electric drive, two lithium-ion-polymer batteries, the charge control device and the servo motors for the swashplate. source
And here is its mesmerizing sibling, AirJelly (with a helium-filled balloon as a body), presented at the same fair.
Last but not least: Here is Aquaroid BT 02 of the aquaroid series made by the Japanese Company Takara Toys in 2000. The robots are powered by solar cells. They float and swim inside tanks of water, changing direction when they hit obstacles.
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