 They have this video, which is really worth a watch, of this small ant walking up to the entrance of the hive. And the bees guarding the entrance kind of pivot around and just give the ant a good bop on the head with its wing and flick it away from the nest. Wow. You know, this technique doesn't always work for them. But at the very least, that slap seemed to kind of like stun the ant and left it open to some kind of follow-up defense.