A melon is not just a fruit, but part of the head of some toothed cetaceans

like dolphins. It is the rounded front part of their head just forward of their

eyes. Inside this part of the head is a fatty, oil filled sack that marine

biologists agree serves as an 'acoustic lens'. This means that the melon acts

like a lens and focuses sound into a narrow beam so that the dolphin can

hear extremely well.

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