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Mystery #1Tier 3how new species form

How does a single kind of animal split into two completely different species?

Long ago there was just one kind of a certain animal. Today there are two of them, and they can't even have babies together anymore. Nothing appeared from nowhere, and nobody designed them on purpose. So how does one animal slowly turn into two?

The Grand Canyon, a huge gash of layered red rock with a river far below, forming a barrier animals on one rim cannot cross to reach the other
Photo: Tuxyso · CC BY-SA 3.0 · via Wikimedia Commons

Your guess

One creature becoming two sounds impossible. What do you think could pull a single kind of animal into two different ones?

There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.

Make a guess to unlock the hints and the answer.