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.
As of Minecraft 1.8 (the 2014 "Bountiful Update"), Java Edition had 39 mobs total, cumulative since the game's start.
37
Put it on peaceful
No, mobs will not spawn in water or ontop of half slabs.
40 mobs, up one from 1.8 with the addition of the Shulker (added in 15w31a, part of the Combat Update).
Creepers can not have kids in vanilla Minecraft. No hostile mobs in Minecraft can be bred.
You kill mobs and players
The squid