Built by Animals: The natural history of animal architecture

From termite mounds that in relative terms are three times as tall as a skyscraper, to the elaborate nests of social birds and the deadly traps of spiders, the constructions of the animal world can amaze and at times humble our own engineering and technology. But how do creatures with such small brains build these complex structures? What drives them to do it? Which skills are innate and which learned? Mike Hansell looks at the extraordinary structures that animals build - whether homes, tr...