No, only zombies can break down doors.
something called silverfish will be able to eat wood. now zombies can break down doors! And villagers can open doors. Now in 1.2, zombies can break through wooden doors, not iron doors. And if you are playing in a PvP minecraft server, an enemy faction(army) can overtake you territory and open your doors. Also if there are wooden pressure plates outside the door mob can stand on them and the door will open.
On hard mode, zombies can break wooden doors down. Endermen can move most materials too, which might mean monsters can enter your house.
No creepers can't destroy obsidian blocks but they can destroy a working portal.
Minecraft was not made by zombies. It was made by Swedish programmer Markus "Notch" Persson.
zombies
parrot
*Spoilers* The Big Doors only open during the last mission where the zombies break in. You have to gather the three parts to re shut the doors
Zombies are one of the first mobs, or mobile entities, in Minecraft. The zombie attacks you dealing damage depending on your difficulty setting and what armor you are wearing. Zombies also attack villagers and upon killing them, turn them into zombie villagers.(Zombie villagers can be healed when affected by weakness and fed a normal golden apple.) Zombies spawn in villages, dark areas, and when it is night. If an area is well lit a zombie cannot spawn unless its a siege in a village. The zombies will set on fire when exposed to daylight. On rare occasions zombies can pick up drop items and wield them as weapons or if it is armor or a head, as clothing. (Zombies do not set on fire by the sun if wearing head gear.) On normal difficulty or higher zombies can also break down wooden doors after repeated hits.
you get carrots in minecraft from baby zombies on chickens or spiders, you have to kill them and then you will get them.
zombies
no