Alex's Mobs

Alex's Mobs is a adventure mod created by AlexModGuy. An animal and creature mod adding over 80 realistic and fantasy mobs with unique behaviors, abilities, and drops. As a adventure mod it concentrates on exploration, structures, and new things to fight, and it has been downloaded around 70 million times, which puts it among the options players reach for in this space.

Alex's Mobs is built for players who want a huge variety of ambient and dangerous creatures across every biome. It adds dozens of animals with bespoke AI, drops, and behaviours, many of which can be tamed, ridden, or harvested for crafting materials. It is approachable enough to drop into a world and use right away, with little setup required.

The mod is available for Forge and NeoForge, so it fits a range of modpacks and launchers. It currently supports Minecraft 1.20.1 and 1.21.1, spanning the 1.20.1 to 1.21.1 releases. It runs on both the client and the server, so on a multiplayer server every player who connects needs it installed alongside the server itself.

Alex's Mobs works particularly well alongside Citadel and Ice and Fire: Dragons. It depends on Citadel, so those must be present and on the same loader and version. It targets the Forge side of the ecosystem, so it fits comfortably into Forge and NeoForge packs.

Alex's Mobs has a modest footprint for what it adds and is widely used in modpacks without notable performance concerns.

If you are comparing options, similar mods include Naturalist and Untamed Wilds. They cover comparable ground, so the right choice usually comes down to your loader, version, and the rest of your pack.