Rebecca Allbritton <[EMAIL PROTECTED]> wrote
>>
>>DEVELOPMENTAL CHANGES IN SEVERAL PARAMETERS OF ULTRASONIC CALLING BY
>>YOUNG MONGOLIAN GERBILS (MERIONES UNGUICULATUS).: Broom, D.M., Elwood,
>>R.W., Lakin, J., Willy, S.J., 1977, Journal of Zoology London, 183,
>>281-90
>
>I wonder why it is that pups and younger gerbils are reported to squeak
>more often in the human range of hearing (fairly low) than older gerbils
>are?
Sorry for the delay in replying.
Possibly it is that these pups do not have to worry about predators so
it is possible for them to make noises in a more dangerous range.
Additional, it may be that noises in that range are more imperative to
adult gerbils than the more high frequency sounds they use for other
purposes.
For example, human babies scream at frequencies that are impossible to
ignore. And human adults rarely make noises like a baby except in very
special circumstances.
>
>Do you have that article to hand, Julian, and if so, what changes did they
>notice as the gerbils grew?
Unfortunately that article is one I have not read. It was added to the
database by one of the other contributors.
--
Julian
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