Casualties of Your Own Success

Evolution knows what it’s doing. And one of the things it does is give animals bigger bodies over time.

Edward Drinker Cope was a 19th Century paleontologist. His work, later deemed Cope’s Rule – not universal enough to call a law – tracked the lineages of thousands of species and showed a clear bias towards animals evolving to become larger over time.

Horses went from the size of small dogs to their modern height. Snakes from no larger than a inch to modern boas. Dinosaurs from 3-inch lizards to a brontosaurus. And us:

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