There are multiple reasons why humans and
animals have different languages. First, when
animals are separated for extended period of time,
languages begin to differ from each other.
Language is constantly changing, very slowly, but
changing. Look at human language. It varies a
lot in different regions of the world. Even
birds, like the brown-headed cowbird in
California, have slightly different accents and
song preferences based on where they are from
Second, animals live in different environments
where some methods of communication work better
than others. For example, animals that live in
dark caves may use a visual language or tactile
(touch). In other environments like thick
forests, sound is the best method of communication
because it can travel the farthest.
So each animal group has evolved its own
language based on isolation from other animals and
by taking advantage of the best method of
communication based on its own environment.
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