Communication

Educational Resources-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

“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)

echolocation

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)

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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