A tangential question: Could the extreme rarity of Njerp war camps have a similar cause as the rarity of the Tufted Duck?
No, since war camps aren't animals.
War camp are rare to find, for many versions already, and although wandering Njerpez can be met anywhere they settle their camps only in the east - and preferably on no man's land.
For verification I tested the functionality, and it worked as it should. War camps are set by wandering Njerpez, rather than merely randomized all over the map. It's unpredictable how often this happens as the Njerpez wander as they please. But rare they are, yes, quite rare.