My whole question is a spoiler, here.
Ender's Game goes into great detail about how the buggers don't need to communicate because they all share one "hive" mind. In fact they appear to be completely unaware of the concept of communication, which is what made it so hard to imagine peace between buggers and humans.
Nevertheless, at the end of the book, it appears there are quite a few queens. Why don't the queens need to communicate with each other?