Endless Forms opens our eyes to the highly complex and diverse world of wasps. Wasps are 100 million years older than bees; there are ten times more wasp species than there are bees. There are wasps that spend their entire lives sealed inside a fig; wasps that turn cockroaches into living zombies; wasps that live inside other wasps. There are wasps that build citadels that put our own societies to shame, marked by division of labor, rebellions and policing, monarchies, leadership contests, undertakers, police, negotiators, and social parasites. Wasps are nature's most misunderstood insect: as predators and pollinators, they keep the planet's ecological balance in check. Wasps are nature's pest controllers; a world without wasps would be just as ecologically devastating as losing the bees, or beetles, or butterflies. Wasps are diverse and beautiful by every measure, and they are invaluable to planetary health, Professor Sumner reminds us; we'd do well to appreciate them as much as their cuter cousins, the bees.