The deer ear swivel
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I learned from reading Jim
juvenile book "All About Deer" a key element that must be fully
understood by the back yard deer deterrent maker.
"A deer can
swivel each of its ears around on its head to listen in two different
directions at once."
This fact indicates that even
the smallest garden could benefit by deploying at least two deterrents
at each end of the protected area.
In my opinion the sound puts
a deer in caution mode, but it's the movement that usually provokes