Headcrabs are fictional parasite-like aliens in the Half-Life video game series. They are small and have rounded smooth bodies with four legs, two long and clawed ones in the front and two stubby ones in the back. They use their large mouth on the underside of their body for feeding and attaching to human hosts, at which point they take over their hosts' nervous system and turn them into a zombie-like state. 

There are different variants of headcrabs: The standard headcrab has a tan-colored body, the fast headcrab is speedier and more spider-like compared to the standard species, the poison headcrab is slightly larger and injects its prey with powerful venom, and the Gonarch is a huge, armored variant that functions as a hive queen.
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