Some animals can hear higher pitched sounds that people cannot, such as this silent-to-our-ears dog whistle.
silence
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Theo Padavano
Draftsman
Some animals can hear higher pitched sounds that people cannot, such as this silent-to-our-ears dog whistle.
The URI to TrackBack this entry is: https://theodraws.wordpress.com/2014/10/08/silence/trackback/
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Theo Padavano
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