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At the age of 16, renowned Australian palaeontologist Tim Flannery made a discovery that would spark a lifelong passion. Along the bank of a creek in his home state of Victoria, he found the fossilised tooth of a megalodon, a giant shark that roamed our oceans millions of years ago. This remarkable find, the tooth was large enough to cover his palm, sparked an interest in palaeontology that was to inform his life’s work and a lifelong quest to uncover the secrets of the world’s largest ever predator, the great shark Otodus megalodon.

Welcome to the fascinating world of Life On Us! Our bodies are home to tens of thousands of species that aren't at all human – on our skin, inside our gut and even in our brain, and they can have an extraordinary impact on how we feel, act and live. Many organisms are microscopic, but some are far longer than we are. Some make frequent but temporary visits, while others stay for a very long time!