The rapid accumulation of change is not always progress, and forward motion is not always an advance. — Jonathan Weiner

Evolution discloses a meaning in death, although the meaning is like some of the berries that Darwin tasted in the Galapagos, “acid & Austere.” There is a special providence in the fall of a sparrow. Even Drought bears fruit. Even death is a seed.

Geneticists will tell you that. Evolution is always happening. What they mean is that the genes of this generation are not precisely what they were the preceding generation. Nor will they be precisely the same in the next. And evolution is that change.

For all species, including our own, the true figure of life is a perching bird, a passerine, alert and nervous in every part, ready to dart off in an instant. Life is always poised for flight. From a distance it looks still, silhouetted against the bright sky or the dark ground; but up close it is flitting this way and that, as if displaying to the world at every moment its perpetual readiness to take off in any of a thousand directions.