Minecraft wiki entry for 2010_Indie_of_the_Year_Awards, associated text: Spider jockeys: a skeleton riding a spider.
Chicken jockeys: a baby zombie riding a chicken.
Slimes: spawn deep within the map and in swamplands.
Villagers: inhabit villages and can trade with the player.
Cats: can be tamed and inhabit villages or swamp huts.
Parrots: can imitate the sounds of nearby mobs.
Wolves: can be tamed by the player and attack enemy mobs if the player engages or is attacked by them.
Llamas: can store items and form caravans.
Mooshrooms: mushroom-covered cows that spawn in mushroom fields biomes.
Vindicators: spawn in woodland mansions.
Pillagers: spawn in pillager outposts.
Evokers: spawn in Woodland Mansions.
Phantoms: spawn when the player hasn't slept for three in-game days.
Pandas: spawn in jungles but are more common in bamboo jungles.