Some subtitles that involve parrots imitating mobs are identical, leading some deaf players to confuse some mobs with others, provided that they have a parrot with them.
Affected mobs:
Zombie and Husk: "Parrot groans" (might be WAI)
Zombie and Zombie Villager: "Parrot groans" (might be WAI)
Zombie and Polar Bear: "Parrot groans"
Skeleton and Wither Skeleton: "Parrot rattles" (might be WAI)
Skeleton and Stray: "Parrot rattles" (might be WAI)
Spider and Cave Spider: "Parrot hisses" (might be WAI)
Spider and Creeper: "Parrot hisses"
Spider and Silverfish: "Parrot hisses"
Slime and Magma Cube: "Parrot squishes" (might be Won't Fix, they don't spawn in the same biome)
Evokers and Illusioners: "Parrot murmurs" (Won't Fix, Illusioners don't spawn naturally)
Comments

In that case, why not just change the subtitles? Because currently, deaf people that are in a world with a parrot cannot tell the difference between a parrot imitating a spider or creeper.
I can, however, happily make a resource pack that changes the parrot imitate subtitles, so I'll leave this issue where it is.
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Intended, these subtitles derive directly from these mobs. Example: the subtitles for zombies and husks (not imitations) are both "... groans."