If you stripped away the wood, what you would see would look sort of like the skeleton of the actual animal.

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What is more, by analysing this pattern the team demonstrated that in a living animal the lenses would focus light on to bundles of nerves found in the skeleton.

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In 1940, three years after her disappearance, the historic aircraft group's website states, a British official "found a partial skeleton of a castaway on a remote part of the island, " along with evidence of a "campfire, animal bones, a box that had once contained a sextant" and remnants of a man's and a woman's shoes.

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