I had 10 hatches in my Stable and set the auto-wrangle to "max 9"
I have another Critter drop-off in a "kill space".
Dupes start wrangling critter one after another and sending them to "kill space" drop-off. They should leave 9 in the room.
I take picture when only 3 was left to wrangle.
- setup a ranch and put 10 critters there; - put a critter drop-off somewhere else; - set the max population to 9 (auto-wrangle); - watch all critters get wangle.