Mounds of West African termites are built to shed water via mushroom-like shape.

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References

"In West Africa and other areas where there is heavy rain, the colonies build nests like mushrooms with flat roofs which shed the water." (Attenborough 1979:100)

Book
Life on Earth: A Natural HistoryLittle, Brown and CompanyOctober 1, 1981
David Attenborough

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