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Action
Outdoors
P O Box 577
650 LeMoyne Dr.
Dauphin Island
Alabama 36528
Local:
(251) 861-2201
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Action
Outdoors
Educational
Resources for Teachers and Schools
Communication
and Echolocation
(Busch, 2002 & Drum, 2003) |
This
section is designed to aid the teachers
in fulfilling the following AHSGE Standards
and Objectives requirements.
Standard:
I-1
Standard:
II-1
Standard: III-3
Standard:
VI-1
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“Dolphins probably rely
on sound production and reception to navigate, communicate
and hunt in the dark or murky waters. Under these
conditions, site is of little use.” (Busch,
2003) |
Communication:
- Toothed whales are unique in the fact that
they can communicate with others and navigate
waters at the same time.
- Toothed whales do not have vocal cords.
- Scientist suggest that “regional whistles”
are generated in the larynx and “clicks”
are produced in the nasal sac (Au, 1993)
- Bottlenose dolphins identify themselves with
a signature whistle, but scientists do not feel
that it is any specific from of communicable
language. (Caldwell, Caldwell, and Tyack, 1990).
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Echolocation:
- Echolocation involves the emission of a sound
and the return of its echo as it bounces off
an object.
- Water is an excellent conductor to transmit
sound.
- Dolphins can emit sound from their melons
(see physical characteristics.
- Most of the dolphins hearing seems to take
place in the lower jaw and it is them transmitted
to the inner ear. Research has shown that the
lower jaw can receive sounds about the frequency
20 kHz. (Brill, et, al, 1998)
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Proceed
to
Conservation
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