In terms of size, mammals are an anomaly, as the vast majority of the world's existing species are snail-sized or smaller. It's almost as if, regardless of your kingdom, the smaller your size & the earlier your place on the tree of life, the more critical is your niche on Earth: snails & worms create soil, & blue-green algae create oxygen; mammals seem comparatively dispensable, the result of the random path of evolution over a luxurious amount of time.
— Elisabeth Tova Bailey
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