Alien creatures are Xenomorphs, terrifying,
carnivorous, second set of jaws inside
Its sharp teeth like razors sharpened, retract again
Can tear flesh and snap bone when jaws open wide

(When you see them, then prepare to die)

Really spooky, wicked bite marks, lightning assault
Mouth widens as strikes are fast. Worse than a shark:
prey can run here or there, but are not spared
creature can smell fear in the air,
acid for blood, no way you can fight it
It‘s coming, you must submit: will tear you apart

Goes for the jugular or rips out your heart!

Pharyngeal jaws, in action, in-n-out quick
Decimating the blow that‘s dealt, how jaws dart!
The only way to fight it is with fire—
Flame-thrower scare, lights up the air
Xenomorph will then flee—flame it can’t bear
But it will come back for you—will not depart!

Alien “Jaws“ coming, open air lock would be smart
trap in an engine, max-burn sends it into void dark…
(on Earth, Pharyngeal jaws- Moray eels have this part)