EQUINE

Unicorn

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

Monstrosities     Swords & Wizardry 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

Pathfinder 2e Bestiary 2     Pathfinder (no source link)

Mythic Monster Manual v1     Pathfinder original/official source

Exotic Encounters     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Monster Monday (web)     D&D 5e original/official source

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

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

D&D 2e Monstrous Manual     D&D 2e (no source link)

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

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

Dragonlance Bestiary     SAGA (no source link)

Critters, Creatures, & Denizens     Dungeon Crawl Classics (no source link)

Monsters Compendium     Heroes Of Adventure (no source link)

Harnmaster Gold Bestiary     Harnmaster original/official source

Iron Falcon Handbook Of Monsters     OSR (no source link)

Adventures Dark And Deep     Adventures Dark And Deep (no source link)

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

Baby Bestiary 2     Any original/official source