A squirrel weighs much more than a bird. When you get your zapper going,
set it off by having a microswitch turn on when the squirrel jumps on
the bird feeder; that will turn it on and zap the squirrel. No need to
How to do it? The bird feed could be attached to a spring that it hangs
from. When it stretches due to the squirrel weight, the micro closes.
The details are up to you.
Unless, of course, you're using your bird feeder to feed vultures ;-)
This is a question that is asked all the time.
Birders have known the solution
since long before anybody knew anything about electricty.
Make what you offer the birds unappealing to mammals.
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