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Exploring the wild world behind his house.

Conservation biologist Hanson lives in the Pacific Northwest, so most of his property is a temperate rain forest, but its rich biome serves him well. Author of The Triumph of Seeds: How Grains, Nuts, Kernels, Pulses, and Pips Conquered the Plant Kingdom and Shaped Human History, he writes that readers who assume a backyard consists of weeds, shrubbery, rodents, local birds, and bugs are in for a surprise. Evolution, ecology, and biological novelties proceed at their usual pace when humans settle nearby. Plenty of exotica live among us. Eighty percent of the small things on this planet and quite a few larger ones have yet to be named, and amateurs discover most of them. An ordinary bed sheet, brightly lit, attracts a torrent of moths including the occasional unknown. Over a hundred thousand households plant the same species of sunflower in their backyards and then take notes on the bees that visit. It was only after 1980 that scientists discovered a distinct habitat in forest canopies. Assisted by a local tree surgeon, Hanson struggles high up a backyard Douglas Fir and discovers an unnerving new environment. In the opposite direction, any patch of ground holds as much life below the surface as above, so soil may be the richest biome on the planet. Or perhaps it’s the world after dark; a Google search produces 235 million hits for “diurnal biology” versus a mere 12 million for “nocturnal biology.” Humans are more afraid of darkness than guns. This is not likely to change any time soon, as the author bumps around with a flashlight, fending off a territorial owl that represents a genuine danger.

Far from the first natural history of the backyard, but a good one.