Diving to depths of around 20 metres, sea otters can access all kinds of food but they often need the help of their favourite rock to crack open their catch.

No bigger than a golf tee, the Nguru pygmy chameleon tends to hide among leaf litter on forest floors. But why are they important to local farmers?

The Animal Sensemaker - one animal, every week to make sense of the world. Brought to you by Tortoise and On the Edge

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