I tested the withdrawal rate of mounted units and discovered the given rate is much lower than the actual rate.
I decided to test what actually happens in a typical game when Nature's Revolt is built.
I was playing the elves on a huge fantasy map at Monarch and Marathon setting. It was the yr. 1725 (of 1801) and there were 6 AI civs left besides mine. I was playing raging barbs and there were Tier IV barbs coming around. I wanted to see if building Nature's Revolt would replace them with animals or at least reduce them.
It really didn't.
Here's what I found:
The turn before Nature's Revolt was built, I opened up the World Builder and counted the barbs. This was really fun on the huge scrolling map.
I counted 93 including 8 Tier IV barbs (2 heavy crossbowmen, 3, lizard beastmasters, and 3 lizard druids).
There were ZERO animals on the map.
The next turn after Nature's Revolt was built, I counted again - more fun.
Here's what I found:
5 Lions
3 Tigers
1 Bear
1 Panther
0 Wolves
0 Spiders
85 barbs
Now, some barbs may have been killed and not yet spawned, but you kinda get the idea from this count that Nature's Revolt doesn't do much. Yes, maybe more animals might have been spawned later, but I sure didn't see many.
So, in conclusion, my strategy of trying to replace barb lizard beastmasters with lions is not a good one.
I was able to capture 2 lions though. I was surprised when my Beastmaster managed to kill, and not capture, a panther.