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Originally Posted by Zeno
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As far as bumping in the sand or rocks ,
I never found it to work for me
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the bumping (knocking) of two rocks together.....whether your standing on a mountaintop or under the sea..... that sound: travels further than anything else... it's why the swiss people invented the yodileyeeeeuuuu shout... easier than carrying around rocks...
it's the sound that lure rattles are supposed to imitate.
its the scurrying of creatures looking for food on
a gravel (pebble) bottom......if you take sand and drop it into your
other hand it makes very little sound...but gravel
goes clackity clack clack..
fish locate prey from hearing that sound....after it travels over to their skin to their bladder and over to their internal ear.