Why I'm Happy I Evolved from NYTimes
Organisms like the sea slug Elysia chlorotica. This animal not only looks like a leaf, but it also acts like one, making energy from the sun. Its secret? When it eats algae, it extracts the chloroplasts, the tiny entities that plants and algae use to manufacture energy from sunlight, and shunts them into special cells beneath its skin. The chloroplasts continue to function; the slug thus becomes able to live on a diet composed only of sunbeams.
Still more fabulous is the bacterium Brocadia anammoxidans. It blithely makes a substance that to most organisms is a lethal poison - namely, hydrazine. That's rocket fuel.
And then there's the wasp Cotesia congregata. She injects her eggs into the bodies of caterpillars. As she does so, she also injects a virus that disables the caterpillar's immune system and prevents it from attacking the eggs. When the eggs hatch, the larvae eat the caterpillar alive.
It's hard not to have an insatiable interest in organisms like these, to be enthralled by the strangeness, the complexity, the breathtaking variety of nature.
Just think: the Indus River dolphin doesn't sleep as you or I do, or indeed as most mammals, for several hours at once. Instead, it takes microsleeps, naps that last for a few seconds, like a driver dozing at the wheel.
Or consider this: a few days after its conception, a pig embryo has become a filament that is about a yard long.
Or: the single-celled parasite that causes malaria is descended from algae. We know this because it carries within itself the remnants of a chloroplast.
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