Minecraft wiki entry for Zombie_siege, associated text: A group of zombies, two of which are villagers, breaking down a wooden door.
An iron golem killing a zombie during a siege, preventing the zombie from breaking down the door.
A siege ending because of the zombies burning in the daylight.
A siege in a desert (where it never rains) during rain in another biome. One zombie burns in sunlight while two others are protected by their helmets.
A zombie attacking a villager while the other one is trying to run.
3 villagers taking cover in a large house during a zombie siege.