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Who cares, pidgeons are rats with wings.
isn`t biology fun :-p
Also, it isn`t pigeon poop, it`s actually their urine...
The pidgeons probably get a heart-attack though..
This is easy to setup. Take a laser, like the ones at the bottom of garage doors to stop the garage door from crushing people, and place it with the laser pointing down the ledge. Connect the laser electronically to the sprinkler control chip. Aim the sprinkler. Wallah.
I want one!