The world of water is different from the world above the surface.
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than right under the surface, whales live in darkness.
therefore not an important sense.
They do have eyesight but it is not
good in most species. Their eyes
are small and not in front of their
heads, but back, behind the jaws.
Instead, they have excellent hearing,
well in water.
They have developed complex noises and sounds to
communicate to each other.
Some species even sing songs
that are repeated
over and over.
Whales also communicate by surfacing
such as splashing their flippers or tails against the water surface, or
breaching out of the water and making a splasing sound when falling
Because their hearing is soo good they can detect all sorts of
vibrations in water, it is thought that the noises of ships and other
human-produced sounds such as navy sonars etc may damage their ears.