Ant bridges and bird-built pergolas: What animal architecture teaches us about evolution

The natural world is full of architecture. We see it in an enormous diversity of structures, like beehives, bird nests, spiderwebs, beaver dams, termite mounds, and burrows. All have one thing in common: they are the product of complex, largely innate animal behavior that does not require that it be taught. How has evolution led this to be the case?

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