Exactly like other whales, dolphins live in a dark world except when
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Deeper down in darkness, eyesight is not important, and most
dolphins don't see very well.
Some, especially river
live in such murky waters that they are almost blind, barely able to
use their eyes to distinguish night from day. Like whales,
have therefore made full use of the fact that sound travels very well
in the water, and developed an excellent sense of hearing.
don't sing long, low-frequency songs
like do baleen
but they use short squeaks and other noises in a communication almost
as complex as a language.
like belugas can be so noisy that they can be heard from out of the
Dolphins have also got a good sense of touch and they also
communicate by touching each other.
The species that have good enough
eyesight, also communicate by leaping out of the water and putting on
some surface display.