When low-tech wildlife conservation solutions actually beat out high-tech

I just started a thread on the WildLabs forum about when low-tech solutions outperform high-tech alternatives. I mention the practice of painting eyes on the rumps of cattle to trick predators into thinking the animal is looking at them (although I can't readily find any follow up data on how well that is performing). And there is livestock guard animals—such as The Livestock Guard Dog program at Cheetah Conservation Botswana which is one of their most cost-effective tools to aid in cheetah (and other predator) conservation.

Do you have others that come to mind? Join the conversation on WildLabs!