The impact of bees, wasps, and ants on our lives -- What are Hymenoptera? -- Some basics of Hymenopteran biology -- A garden of Hymenoptera -- The garden’s cows : sawflies -- The garden’s police : true parasitoids, stinging parasitoids, and a few surprises -- The garden’s wolves : predatory wasps -- The garden’s pollinators : bees -- The garden’s recyclers : ants.