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Zombies were the second hostile mob that was added to minecraft. They are the replacements to the first mob AKA human mobs. When zombies were first released they dropped feathers. in 2008 they changed it to rotten flesh and rare iron drops. They can break down wooden doors in hard (Hardcore included). They can infect villagers 0% infection in easy, 50% in normal, and 100% in hard.
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On very rare occasions a baby zombie will spawn riding a chicken, this is known as a chicken jockey. They are deadly because they do not take fall damage, they float in water, and they are very fast.