Artificial jellyfish created from heart cells
23 July 2012 Last updated at 17:20 BST
Scientists in the US have shown off a free swimming artificial jellyfish.
Video footage shows how the replica closely mimics the swimming behaviour of a real jellyfish.
The team members built the replica using silicone as a base on which to grow heart muscle cells from rats.
They used an electric current to shock the artificial animal into swimming with synchronised contractions.