Mods for new mobs

The More Planets - Galacticraft Add-on modification adds new planets, blocks, items, mobs, and much more for the Galacticraft mod.

Rough Mobs 2 - a mod that makes vanilla mobs harder. Zombies, skeletons, creepers, and other mobs have new abilities and enhanced characteristics.

Grizzly bears have been added to your Minecraft world in the Grizzly Bear Mod! They attack animals and spawn in the taiga. New challenges and adventures await you!

Mod that reworks interaction with wolves. Adds different variants of vanilla wolves, dog beds, and bowls.

Petrock is the only mod with a stone pet that you will ever need.

The best dungeons - a mod for Minecraft that adds new structures, mobs, and items, expanding adventure possibilities.

The Earth2Java mod for Minecraft Java Edition adds creatures and items from the game Minecraft Earth.

Witching Gadgets - an addon for Thaumcraft 4 that expands its capabilities and interaction with other mods.

Metamorph - a mod for Minecraft that allows you to turn into mobs. Each of them has its own abilities and attributes.

The mod for Minecraft called Ranchable Fluid Cows is an addition to Moo Fluids and MineFactory Reloaded. You can milk cows from Moo Fluids using the rancher from MFR.