Weaver birds -- Location and design -- Architect's words: choosing a site -- Animal tools -- The magpie's nest -- The beavers' lodge -- Structure and construction -- What is a colony? -- Architect's notes: a building team -- Termite colony -- Architect's notes: air flow -- Burrowers -- Digging down -- Bees and wasps -- Hexagons -- Spiders -- Architect's notes: spiral designs -- Insect hotel -- Activity: build an insect hotel!.