MecaBotiX is a start-up specialized in mechanical engineering and robotics, for innovation / design / CAD / prototyping of machines and robots. We develop a range of innovative robots : the cooperative mobile manipulators M3Cooper, that can work alone (mono-robot) or in a group (poly-robot), self-adapting to the task according to its complexity, required workspace and payload to manipulate. The considered tasks cover payload transport, obstacle crossing, dextrous manipulation, milling, etc. These are highly reconfigurable and stardardized, in order to replace a complete range of varied robots, decrease acquisition and exploitation costs, improve failure tolerance and utilisation rate. Our poly-robots find various applications, from Industry 4.0 (manufacturing, logistics...) to agriculture or civil safety.