SaiSounds
Want the mobs in Minecraft make SaiScribbles' animal noises from her stream of My Voice Zoo? Of course you do! Enjoy!
Goated
There's screaming goats!
Penguins? In Minecraft?
Well you're right, there are no penguins in vanilla Minecraft, so this fella's voice will be showing up as a surprise for another mob.
Polar Bears
These guys pull double duty and have to cover regular bear sounds in addition to their own sounds.
Parrots
Parrots are known to mimic human speech, we really put that to the test here
Sheep
These sheep come stright from Animal Farm
More Birbs
Vanilla Minecraft doesn't have any eagles, but there are still plenty of other things that fly and I be they're super patriotic
Pandas
Yep, we've got panda sounds too
OMG Who's that?!
I can't put my finger on it, but that frog looks familiar.
Wolves/Dogs
Shouldn't Mojang be calling tamed wolves "dogs" at this point? I think so.
Kitty!
Kitty!
Turtles
Turtles have long been close friends with frogs, they deserve the spotlight for their loyalty and good nature (and their love of pizza and karate).
And Many More...
A bunch more mobs get Sai sounds and even more get sounds from animals that aren't in vanilla Minecraft but fit the general vibe.