If I hear a skeleton, or a zombie, how far away could he be? Obviously he can be right next to me, but what is the largest possible range?
I've done some testing, and it seems that it is 16 blocks, from the mob's head to yours. I tested by encasing a pig with dirt, but I assume that it's the same for all mobs. Except Ghasts, that is. It's definitely longer there, probably 100 blocks.
BTW, yes, the pig is perfectly fine except for the time I accidentally hit him, and the time that he got shot by a skeleton.
I built A chicken farm once, and I put it outside of the audible zone of the player (Because chicken farms are loud and quite obnoxious)! Anyway, I did a little experimentation with the project, and discovered that Minecraft player's audible zone of hearing, is 24 or more blocks away from you.
it can depend. mobzilla from orespawn can probably be heard from 200+ blocks away. I think that in a mod called the john mod, the mega john can be heard from over 500 blocks away. it depends on how loud the mob is, and what your device's volume is on. (note: i don't own either of the before mentioned mods)