Found your problem (all of ours problem), in entitygroups.xml:
<entitygroup name="WildGameForest">
<entity name="invisibleAnimal" prob="50"/>
<entity name="animalRabbit" prob="48"/>
<entity name="animalChicken" prob="48"/>
<entity name="animalBoar" prob="1"/>
<entity name="animalStag" prob="1"/>
<entity name="animalDoe" prob="1"/>
<entity name="animalWolf" prob="1"/>
</entitygroup>
So if RNG spawns a forest game animal, here's what you get:
Invisible animal (equivalent to "no animal" I guess): 33%
Rabbit or Chicken: 32% each
Boar, Stag, Doe, Wolf: 0.67% each (in A18, stags were about 2.3% and does were about 6.6%)
Setting those last four "prob" values to 2 would probably be noticeable. I tried 5 (equating approximately a 3% chance for each large animal) and it was definitely noticeable.
As for mountain lions:
<entitygroup name="EnemyAnimalsSnow">
<entity name="invisibleAnimalEnemy" prob="40"/>
<entity name="animalMountainLion" prob="40"/>
<entity name="animalDireWolf" prob="10"/>
<entity name="animalBear" prob="10"/>
</entitygroup>
The probs here are normalized to 100 so math is easy:
40% chance of "no animal"
40% chance of mountain lion
10% chance of dire wolf
10% chance of bear
Does someone have an idea where the problem is and how can it be solved?
Attached is a modlet that will double the chance for larger game animals in the forest. Does will be 2x as likely as stags. It's still a pretty small chance (1.3% for boars/wolves/stags, 2.6% chance for does), but it ought to be noticeable. Easy to edit the modlet if you want even more - it's just four lines.
View attachment BoidsStagParty.zip