Re: Questions

From: Tom Ford (tjfketos@rcn.com)
Date: Wed Mar 09 2005 - 20:53:56 EST

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    Dear Danielle ,

    Grey whales do indeed communicate among themselves. They use several types
    of sounds.
    The sounds are :
                               Calls in a frequency range of 0.2-2.5 kilohertz
                               Moans
    0.o2-1.2 kHz
                               Modulated pulse 0.08-1.8 kHz
                               FM sweep 0.10-0.35
    kHz
                               Pulses
    0.10-2 kHz
                               Clicks
    0.10-20 kHz .
    These sounds are used for social communication and perhaps finding food and
    direction. Grey whale sounds differ from toothed whale sounds because they
    are in low frequencies. Toothed whales are also called odontocetes.
    Grey whale sounds do not differ from other filter feeding (baleen) whales in
    general. They are not as low as blue or fin whales but are not as high as
    minke whale or humpback sounds.

    Grey whales are identified photographically. Individual animals can be
    catalogued by scars pigmented areas or tail fringe patterns.

    The top three threats to grey whales are :

                       1) chemical and sound pollution of the oceans.
                       2) disease
                       3) predation by killer whales and sharks.

    I hope this fufills your request.

    dr. Tom Ford

                   

    From: "Robert Wighton"
    Date: Tue, 8 Mar 2005 19:48:09 -0800
    To: "Dr. Tom Ford" <tjfketos@rcn.com>
    Subject: Questions

    Dear Dr. Tom Ford,
     
    I am a grade six student doing a report on grey whales and I have a few
    questions that I'm having trouble finding answers to. I'd really appreciate
    your help on these.
    1. How do grey whales communicate and how are their vocals different from
    other whales?
    2. What method is used for identifying individual grey whales?
    3. What are the three top threats to the grey whale?
     
    Thank you for your help.
     
    Danielle



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