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Most of the following features are stored in "assets\minecraft\optifine\random\entity" folder in this pack, can try removing the ones you don't want.
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- brown bear
in any non-natural spawning biomes for polar bears

- black & white cow
random variants for temperate biome cows

- slightly darker green creeper
random variants

- brown frog
random variants for temperate biome frogs

- swapped warm and cold biome frog variants
rename the frog textures in the "assets\minecraft\textures\entity\frog" folder if you want it reverted back to vanilla

- dirty hoglin
random variants

- muddy pig
random variants for temperate biome pigs

- topless piglin
random variants

- topless zombified piglin
random variants

- black skin sheep
random variants

- hoodless or topless stray
random variants

- tarantula spider
random variants

- black & yellow cave spider
random variants

- orange squid
random variants

- greener glow squid
random variants

- brown sea turtle
random variants

- topless zombie
random variants

- topless drowned
random variants

- naked husk
random variants

- gray dolphin
random variants

- darker silverfish
random variants

- green and dusty witch
random variants

- pillagers facepaint/skintone/hairstyle/clothes color
random variants

- vindicators facepaint/skintone/hairstyle/clothes color
random variants

- evokers facepaint/skintone/clothes pattern
random variants