Why zebras evolved their stripes A zebra's unmistakeable stripes may have evolved to make the animals unattractive to blood-sucking flies, say scientists. Zebra in the Masai Mara (c) BBC

Ayumu the chimp completes a computer game (c) BBC/Professor Tetsuro MatsuzawaApe versus machine

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Mushroom coral (c) Pim Bongaerts Corals inflate to escape the sand

Time-lapse footage reveals how mushroom corals inflate and deflate to free themselves from smothering sand.

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“If the koalas need a place to live other than Australia, they can bunk with me. They are so cute:)”

lemonbalm13 discussing koalas on Twitter

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