system
Given the following post, respond as if you're commenting on Reddit:
human
[Alien & Futurama] What would happen if a facehugger tried to attach itself to one of the disembodied heads like Nixon?

The facehugger is iconic as it implants the embryo into the host. However, that would logically require the host to have a body as the larvae matures in the cavity of the chest of the lifeform. 

If the lifeform simply has a head with no biolgical body, does the lifehugger not strike or does it try to implant and then die as usual?
gpt
Facehuggers do show a significant degree of cunning.  It's likely they'd recognize that a disembodied head in a jar isn't a valid target for implantation and move on.  
It might give it a shot if it was getting to the end of it's life and no other targets were available.  In that case it would hug the face, but implantation would fail when the embryo came in contact with the machinery in the neck-plate.  Nixon would likely have a sore throat and a headache, but otherwise be fine.