Here's a permie-solution to a big problem - elephants that were raiding crops in Africa posed a problem to the farmers, who couldn't always afford the fences it would take to keep them out. Manual labor was an option, but it was an around-the-clock and potentially dangerous job. The solution? Bee hives every 30 feet or so, connected by wire.
Elephants crossing the wire would disturb the
bees, who would then attack the intruder. Apparently, the soft skin on the underside of the truck is susceptible to bee stings. The elephants have learned that the sound of
bees is not something to be around for.
The hives also provide pollination and honey to farmers, helping offset or pay for the cost of installation. I dig it! I originally got wind of this from the excellent design podcast, "99% Invisible." Here's the full article:
http://99percentinvisible.org/article/invisible-fences-farmers-plant-beehive-guard-posts-repel-elephants/
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