WEBVTT

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(Music)
Joan Cartan-Hansen, Host: Many

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animals have better hearing
than humans.

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Their hearing is different
from ours for many reasons...

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because of where they live,
the shape of their outer ears,

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how they catch food,
and what they need to do to

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survive.

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In general, humans hear sounds
in the range of 64 to 23

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thousand hertz.

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Porpoises can hear a much
wider range of sound, from 75

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to 150 thousand hertz.

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Cats can hear a wider range of
sound than dogs can.

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Elephants can make sounds at
an infrasound level that is a

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frequency lower than humans
can hear.

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Bats, on the other hand, use
ultrasonic sounds.

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That is sounds and frequencies
higher than humans can hear.

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But the animal with the best
hearing may be the moth.

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Moths have super sensitive
hearing in a very wide range,

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probably so they don't get
eaten by bats.

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Opps!

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Didn't hear that one coming.

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For more information about
hearing, check out the science

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trek website.

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You'll find it at
idahoptv.org/science trek