Bee fence

A notorious bull elephant ... has been tracked by GPS leading crop raids in Kenya.

Since elephants are known to buzz off at the mere sound of bees, Lucy King of the University of Oxford designed a fence made of beehives to deter rampaging elephants. 'We designed the beehive fence as an affordable and practical way to create a barrier that the elephants would be afraid to cross,' she says.
A pilot study in the African Journal of Ecology showed that a farm protected by a beehive fence had 86% fewer successful crops raids than a 'control' farm without such a fence.

.