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Owlbear

The Monsters & Creatures Compendium     Any (no source link)

Dracopedia Bestiary: An Artist's Guide     Any original/official source

The Monsters Know What They're Doing     Dungeons And Dragons original/official source

Angry Golem (web)     D&D 5e original/official source

Atlas Animalia     Any original/official source

OSE Encounter Activity Tables     Any original/official source

Pathfinder 1e Bestiary 1     Pathfinder original/official source

Pathfinder 2e Bestiary 1     Pathfinder original/official source

Dungeon Denizens Revisited     Pathfinder original/official source

All Sorts Of Critters (web)     Pathfinder original/official source

Mythic Adventures     Pathfinder original/official source

Talented Bestiary     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Flee, Mortals     D&D 5e (no source link)

Monster Ecology Anthology     D&D 5e (no source link)

Monster Manual     D&D 4e (no source link)

Dungeons And Dragons Essentials: Monster Vault     D&D 4e (no source link)

MojoBob (web)     D&D 2e original/official source

D&D 2e Monstrous Manual     D&D 2e original/official source

Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)

AD&D Monster Manual     AD&D 1e (no source link)

The Petersen Bestiary     Torchbearer original/official source

Mystara Adversary Compendium I     Dragon Age original/official source

Monsters Of Luclin     Everquest original/official source

The Monster Overhaul     OSR (no source link)

Lairs And Encounters     Adventurer, Conqueror, King (no source link)

Baby Bestiary 1     Any original/official source