Fabric Mods for Minecraft 1.21
Browse 8 free Fabric mods for Minecraft 1.21 — popular picks include oSzoukaua's: Realistic Spiders, Realistic Wildlife, More Kittens.
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oSzoukaua's: Realistic Spiders
This pack makes spiders more realistic! and much cuter!
Realistic Wildlife
Real ecosystems for Minecraft. Wolves pack-hunt, sheep alert their herd, foxes stalk at night, and populations balance naturally
More Kittens
This mod makes a cat litter more realistic, by instead of breeding only 1 kitten, it can vary between 3 to 5 kittens

realistic horse control
Vanilla horse riding that actually feels like horse riding. Camera follows the horse, gallop shakes the screen, stamina limits sprinting, and you can ride through leaves without dismounting. Fabric 1.21.1, fully configurable.
More Realism (MR)
This project helps you experience your world more realistically.
LitePhysics
Realistic collapse, explosions, debris, item physics, and mob ragdolls make destruction feel alive. Builds fall naturally, blasts launch blocks, debris bounces, items tumble, and mobs slide, float, and fade away.
Enhanced Villagers
More realistic villagers
MegaGanDon
MegaGanDon is a giant aquatic mob (megalodon) for Fabric 1.21.x: realistic swimming, neutral behavior with aggro when attacked, jumping on land, spawning eggs, sponge drops, and localization. Lightweight and customizable.