Great Men and the Environment
We all recollect Mr. Darwin's famous statement of the influence of cats on the growth of clover in their neighborhood.
Well, I didn't recollect it, but here it is. Clover needs humble bees (bumblebees, I assume) for pollination, bees have their nests destroyed by mice, and mice are killed by cats, so bees are more common near towns (and by implication, clover).
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