Catch My Drift

In a lizard population, those with longer legs can run faster and escape predators. Over time, long-legged lizards become more common.

Hunters over-harvest a fish population, leaving just a few fish with rare striping patterns. Now, most of that species has stripes.

Five birds accidentally get trapped in a shipping container and are transported to a new continent. Their descendants look and behave differently than the original population.

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