**Headcrabs** are parasitic creatures that feature in the Half-Life video game series. They are alien creatures that originate from the planet Xen and are known for attaching themselves to the heads of their hosts and taking control of their nervous systems, turning them into zombies known as Headcrab Zombies. Despite their small size, Headcrabs are one of the most iconic and memorable creatures from the Half-Life series, and they have become a staple of the franchise's lore and fan culture.
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