Our research perspective is to develop mechanisms for gathering information efficiently in disaster sites. Ideally this requires mechanisms with capabilities of flexible, on-site, adaptation of the overall shape and of the locomotion strategy to unknown and unstable environments. We have been developing three-legged modular robots which can be interconnected to cooperatively achieve multiple locomotion modes and collaboratively perform tasks that cannot be done by a single module. In this paper, we report the development of experimental modular robots and experimentations with their cooperative activities which evolve out of their various inter-connectivity options.