List the heads. I can't see those image
~ @Killdogx
Top to bottom left to right:
Squid, silver fish, villager, iron golem, snowman, bat, horse, mushroom, ocelot, wolf, cow, pig, sheep, chicken, enderman, witch, ghast, skeleton, wither skeleton, blaze, cave spider, spider, creeper, zombie, pigman, magma & slime