This is a research robot, aimed at studying team work and inter-robot communication. To do this, the s-bots have several special abilities:
Using their gripper (red in the photos), they can connect. Then they can, for instance, pass over gap and steps where a single robot would have failed.
Using their integrated force sensor, they can coordinate to retrieve an object to a certain location without the use of explicit communication. This is the way ants bring preys to the nest.