yes
Chat with our AI personalities
No, Creepers just flee from them.
Yes, creepers were an error, they messed up a pig...
No, Creepers do not burn, the sun burns undead such as Zombies and Skeletons.
Nothing.
Monster spawners do not (as of the version 1.3.1) ever contain creepers naturally. It is possible to get a spawner that spawns creepers by editing the game's code or by using mods.