Xenomorph

He got into an organism,
Injected embryos into intestines,
He's preparing the reproduction,
Incubation period is near.
Death at the moment of birth,
The body is caught in severe convulsions,
Horrid scream, sinews are broken,
Pungent reek of the open body.
Xenomorph is free,
Ideal biological structure,
The first phase is complete,
The carrier has its task.
The next phase of evolution,
The full-grown form,
Led by killing instinct
Collect its toll.
Quintescence of evil, full of cruelty,
Gives beginning for new life.