There is an African plain, there are trees, grasses, some seasonal rivers/lakes, and snakes.

Upon the plain lives a society of tribesmen (think along the lines of the [Maasai Mara](https://en.wikipedia.org/wiki/Maasai_Mara) people)

[![enter image description here](https://l7.alamy.com/zooms/5e1e3bdb36f9477cbb4c5d1f00c5a17b/kenya-narok-district-maasai-men-walk-home-across-the-short-grassy-bfmrj0.jpg)](https://l7.alamy.com/zooms/5e1e3bdb36f9477cbb4c5d1f00c5a17b/kenya-narok-district-maasai-men-walk-home-across-the-short-grassy-bfmrj0.jpg)
[This image used with permission: Source (Alamy)](http://www.alamy.com/stock-photo/masai-mara-tribe.html)

These tribes love life, but hate snakes - they are the embodiment of the evil spirits, they cannot be eaten, they also cannot be killed (life is more treasured than evil is hated).

Of course, there's plenty of snakes around.

So the question (obviously) is how can the tribesmen get the snakes off the plain?
['https://worldbuilding.stackexchange.com/questions/72475', 'https://worldbuilding.stackexchange.com', 'https://worldbuilding.stackexchange.com/users/-1/']
> 
> Kookaburra roams through the plains with glee, eating all the snakes
>  with a grin is he, laugh, Kookaburra laugh, Kookaburra full your stomach
>  must be.
> 
> 
> 

The humble Kookaburra! <https://en.wikipedia.org/wiki/Kookaburra>
A less well known Australian bird who loves to eat snakes and small rodents (solves two suspected problems here!!) 

My only problem would be that they would usually nest in a tree, so if there are no suitable trees around, we may have to make a hybrid kingfisher-kookaburra breed which would use the habitat of the kingfisher which is small holes in sand-mounds.
Do what any human does and kill them
------------------------------------

Look at human history, you can likely easily name 5 animals off the top of your head that humanity has hunted to extinction. Unless the animals mass breeds like insects, early man has always had dominion over animal life. 

If these people truly hated and despised the snakes, to the point that they saw it their religious duty to god to kill them, the snakes wouldn't stand a chance. Humans always win.