Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Zombie Voices Free.
Zombie Voices v1.3
– Game Sound Solutions – Zombie Voices
– A collection of incredible 157 zombie voices, including growls, moans, attacks, breath, eating and more.
– The voices are divided into six categories. Children, regular zombies, female zombie, Superzombie, Aggressive zombie and Zombies voices with blood
– They are 44 kHz, 16 bit mono WAV’s, and are ideal for any zombie game
– Lissen the demo here.