Learn to be an Alien

Procedural landscape generators are often used in videogames, for example to create new unexplored planets. What would a procedural creature generator look like? Recent experiments demonstrate that a neural network can learn how to control robot arms, if it has enough to explore with. Your task is to create a 3D editor that allows users to define a new kind of alien creature - legs, claws, sensors whatever - which then learns how to behave through experimentation with the laws of physics applying to its own body in a simple environment (furniture food etc).