It may or may not be a good idea. In the real world, dogs do not communicate with cats and horses. If we see it as a competition in a natural-like environment where each creature represents a species, then communication may not be a good idea.
Originally posted by solarflare
In any environment with many characters, such as this, there is bound to be some level of diplomacy. Whether two units decide to share vision, or protect each other, or ambush another unit, or if a unit robs another unit of its food in exchange for sparing its life, etc., there will always be something. It would be a mistake not to include some sort of communication method between units. Perhaps not in the original version, but if possible it should be incorporated.