The biggest one belonged to the genus Vespa. It’s called hornet.
In spring a female starts to build her nest and produces the first eggs from that will born new subjects (all females).
In autumn the ‘queen’ stops to produces eggs and when the latest is opened the queen stops her hormone production and other females with new males can reproduct themselves, also mixing themselves with other subjects of other nests. This for improving genetic variabilities.
The old queen with her court dies at the end of autumn, the males after mating also die. Only the young fecundate females pass the winter in protect places, so in the next spring the cycle re-start again with new subjects.
The beautiful nest is made by rotten wood shaped by mouth of vespa up to procuce a sort of paper.