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The secret of the gull's ability to survive drinking salt water lies in a pair of glands in the head, but their function was not eluciadated until a few years ago. Each gland consists of thousands of minute tubes arranged like the bristles on a bottle brush. Where the handle of the brush would be is a central tube communicating with the nasal cavity. A rich supply of fine blood vessels surrounds the gland, which extracts the salt from the blood.

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15y ago

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