Gastral drumming:
We have known since the 1960s that several species of wasp perform “gastral drumming” from time to time – banging their abdomens against their nest walls in a series of short bursts.
The scientists who first reported this behaviour thought it may be a signal that the wasps were hungry. Meanwhile, other researchers suggested the wasps might be telling nestmates about food sources. Such “recruitment” behaviour is common in social animals, from house sparrows to naked mole rats. [“Wasps drum with their stomachs to tell each other about food,” Richard Kemeny, NewScientist (14 April 2018)]
