Mobs are enemies, so I suppose that there wouldn't have been.
planetminecraft.com
There are no hostile mobs in peaceful mode, but wolves will fight back if you attack them.On creative mode, hostile mobs are passive, so they aren't technically enemies. They will attack if you hit them, but you're invulnerable anyway.
You can download mobs minecraft comes alive
In Minecraft Classic, mobs can't spawn, so they can't exist naturally. If you play the Survival Test, and when mobs spawn there, you can save it and open it in creative mode so then the mobs can stay there. However, in Minecraft Creative Mode, mobs can spawn, but they can't hurt you because you have no healthbar.
Put it on peaceful
37
No, mobs will not spawn in water or ontop of half slabs.
Creepers can not have kids in vanilla Minecraft. No hostile mobs in Minecraft can be bred.
You kill mobs and players
The squid
Ghasts are one of the biggest mobs in minecraft. They look like giant jellyfish.
The Guardian