We know that farmers, specifically cattle herders, use poison to kill predators such as the African lion. They do this by lacing the carcass of a cow with poison. This can have the effect of wiping out a whole pride of lions but in addition it also kills the vultures which feed on the carcasses of poisoned lions.
Almost half the vultures in Africa are on the brink of extinction simply because they scavenge on meat which has been poisoned by farmers.
Because vultures’ digestive tracts are extremely acidic their digestive system kills the spores of certain diseases such as anthrax which infest the carcasses of dead animals on the African Savannah.
This helps to contain diseases such as anthrax and therefore the vulture provides a service to humans. There is the occasional outbreak of anthrax which kills humans. The disease is passed to humans through contact with animals or eating infected meat.
You could argue that this is an example of “what goes around comes around”. Carelessly poisoning precious wild species to protect cattle can, I suppose, be understood because farmers are desperate to survive in a difficult environment but the consequences often go far beyond those envisaged by the perpetrators. It is an ignorant and crude way to proceed.
There are many alternatives to poisoning lions which is itself a species rapidly heading towards endangerment and in the long-term possible extinction.
It is up to local governments or the national government to find alternatives which protect both cattle and lions allowing both to live in relative harmony. This will entail the commitment and involvement of cattle herders and farmers and it will involve an educational programme.
Scaring lions away, simplistic as it sounds, is effective and is a good alternative to killing them. This is just one example.