hi, there is a lot of controvery over this and different opinions, I was told by phone in October before the Pleo Rb came out in Dec. 2010, by Derek Dotson, that they could, but the conditions had to be just right, with the Pleos lined up just right facing each other and they would recognize each other, since then though, I have heard and read on here that they can't. so I think it is up in the air, or at least thought that they could. It is for sure though that Pleo Rb can communicate with each other, I would say though that if you have a Pleo and a Pleo Rb, even if they can't ACTUALLY communicate, it LOOKS enough like they do to make the play interaction expereince fun and the two Pleos can co-exist next to each other while each having fun. Sorry if that didn't answer your question, but I know others will answer too.
RWM