system
Given the following post, respond as if you're commenting on Reddit:
human
[Half-Life] Can Head Crabs successfully control other species? Is their ability to control hosts an evolved ability or something tailored specifically for humans?
gpt
Yes.

It's an evolved ability (or rather, a bioengineered one- remember the Gonarch?) but not one necessarily unique to humans.

As to the inevitable follow-up question: Some creatures do not have the proper anatomy, and others have abilities that make control unlikely at best (such as the ability to generate massive energy surges around one's body).