Chickens are passive mobs that first appeared in Alpha mode.
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The Chickens were the first added or it was the steve you could spawn in your world back then.
The first mob in Minecraft was the Human, which could be spawned by pressing G and looked like Steve. It was later removed in Classic.
Go to minecraft wiki and do a search for "mob grinder" and it gives you a tutorial of how to do it.
You cant find a giant mob in vannilla minecraft but you can sumon him using a command or a spawner.
Mobot
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