Posts tagged evolution
Indecisive Evolution: Where did whales come from?

It is tempting to think of evolution as a linear process. You start with some primitive creature like an amoeba or a slug and over time you get rid of the slime, add some legs, maybe a bit of fur and you’re on your way to something more advanced. Unfortunately this is utterly and completely false. Natural history is full of examples of animals that just don’t change no matter how much time you give them. Crocodiles and sharks are two well-known examples but the clad of stubborn animals also includes horseshoe crabs, dragonflies, coelacanths and nautiluses, just to name a few. Other animals oppose the idea of straight-line evolution in an entirely different way: they change, and then change their minds about changing.

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