Games like Bird Simulator
Games like Bird Simulator include Goat Simulator, Wobbly Life, Garry's Mod, Chained Together, and Gang Beasts. We matched them by the tags players give Bird Simulator on Steam (Simulation, Indie, Casual, Adventure, and Massively Multiplayer): closest matches first, and among equally close ones the better-known games.

Goat Simulator
Shared: Simulation · Casual · Indie

Wobbly Life
Shared: Adventure · Simulation · Multiplayer

Garry's Mod
Shared: Casual · Multiplayer · Physics

Chained Together
Shared: Adventure · Casual · Multiplayer

Gang Beasts
Shared: Multiplayer · Casual · Funny

Tower Unite
Shared: Casual · Multiplayer · Massively Multiplayer

Who's Your Daddy?!
Shared: Simulation · Multiplayer · Funny

BeamNG.drive
Shared: Simulation · Physics · Destruction

Golf With Your Friends
Shared: Casual · Indie · Multiplayer

Human Fall Flat
Shared: Adventure · Multiplayer · Funny

Totally Accurate Battle Simulator
Shared: Simulation · Indie · Funny

Granny Simulator
Shared: Simulation · Indie · Multiplayer

Beasts of Bermuda
Shared: Simulation · Adventure · Massively Multiplayer

Wreckfest
Shared: Simulation · Indie · Multiplayer

RV There Yet?
Shared: Multiplayer · Adventure · Funny

Turbo Dismount™
Shared: Simulation · Funny · Physics

How to Fish
Shared: Indie · Multiplayer · Adventure

Viscera Cleanup Detail
Shared: Simulation · Multiplayer · Indie

House Flipper
Shared: Simulation · Multiplayer · Casual

Feed and Grow: Fish
Shared: Simulation · Indie · Early Access

The Isle
Shared: Simulation · Multiplayer · Massively Multiplayer

Flashing Lights - Police, Firefighting, Emergency Services (EMS) Simulator
Shared: Simulation · Adventure · Physics

Pikuniku
Shared: Indie · Casual · Adventure

Notes of Soul
Shared: Massively Multiplayer · Adventure · Indie