There is also the alien that is on the kid's backs. I can't remember what they were called. Also, I remember - this is not an exact quote but rather a memory of the scene, so please correct it --- the biology teacher guy talking about how one of his students asked why if the Skitters have so many legs, why didn't the Mechs look like them also. The Mechs seemed like a robot a human would create. I wonder if there is a third alien in the ships that we haven't seen yet.