You know I'm guessing that this person who is doing this is getting other neighbors upset also.
It might be easier to let them go into conflict with him first and let them handle it.
If you put resources into it, it will be time and resources you can't get back.
But nobody likes having their yard taken over by others, or their house for that matter, so its VERY very likely that others don't like this also.
Also if you run the investment expense to put up a fence there's a chance it won't work also, because they jump fences easily. My chickens jump my fence partitions literally all day to steal food from the divided flocks (the younger group especially). So you could end up being more frustrated if you spend money on it and then see them jump right over it, or flight jump it.
It might be easier to let them go into conflict with him first and let them handle it.
If you put resources into it, it will be time and resources you can't get back.
But nobody likes having their yard taken over by others, or their house for that matter, so its VERY very likely that others don't like this also.
Also if you run the investment expense to put up a fence there's a chance it won't work also, because they jump fences easily. My chickens jump my fence partitions literally all day to steal food from the divided flocks (the younger group especially). So you could end up being more frustrated if you spend money on it and then see them jump right over it, or flight jump it.