Minecraft wiki entry for Zombie, associated text: Cows
Ocelots and untamed cats
Untamed wolves
Mooshrooms
Adult chickens (the only jockey that is in use in Java Edition)
Pigs
Pandas
Sheep
Horses
Donkeys
Mules
Zombie horses (unused jockey variant)
Skeleton horses
Adult zombies
Adult zombie villagers
Adult husk
Adult zombified piglins (unused)
Spiders
Cave spiders