National Geographic Society

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The Barreleye fish has a see-through head, but that's not the weirdest part.  Its eyes are in fact the two green domes sitting towards the back of its head.  Each retina is packed with cells that are super-sensitive to light.  The fish uses them to look upwards, searching for the faint silhouettes of prey or predators far above.

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Billions of years of evolution and more than 1 million species of animal have created very weird world and some very bizarre body parts. From sex-crazed slugs to Kung Fu crustaceans, from blood-firing lizards to zombie snails, we journey from the ocean depths to deserts and tropical rainforests to reveal that for some creatures, the truth really is stranger than fiction. We showcase some of the strangest, most shocking animal appendages on the planet, and uncover their evolutionary advantages.