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Hearing
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Dolphins hearing abilities, in water, is one of the most refined senses in nature.
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Dolphins have o well-developed acute sense of hearing.
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Most sound reception probably takes place through the lower jaw.
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Dolphins may also receive sound through bone, soft tissue and the external ear.
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Above water the dolphin hearing is not as good. If you shout in a normal tone of voice you are right near the bottom of its hearing spectrum.
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Eyesight
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Dolphins have very fine sight, both in and out of water.
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Dolphins are colorblind.
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Glands at the outer cornea secrete an oily, jelly like mucous that lubricates the eye and protect them from salt water.
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Dolphins can achieve global vision by slightly moving their eyes in either direction.
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Dolphins do not become long-sighted in water like humans do.
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Touch
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Although dolphins have a thick layer of blubber covering their bodies, they are very sensitive to touch.
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Dolphins appear to use their tongue to feel or touch certain objects, as we would use our fingers.
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Taste
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Dolphins have a good sense of taste for sour and bitter but not so such for sweetness and cannot detect salty sensations at all.
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Smell
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Olfactory organs, bulbs, and nerves are absent in all toothed whales, indicating little or no sense of smell.
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