The research season has begun, somewhere in a hidden field in the middle of the countryside. Day in and day out, 16 radio antennae follow little mice in their holes and tunnels under the ground. Eight sectors are separated by steel plates, running two metres down into the ground and 1 metre above it. Four sectors are also protected by nets to defend the mice against birds of prey and predatory animals. Here there is flourishing vegetation that is to be found nowhere else in the world.