The monsters reproduce by raping human women. This is implied once, and show onscreen once.
A small creature bursts from a woman's body; loads of blood and gore spray everywhere.
The monster rips a man's neck open; a burst of blood sprays from his wound.
Other people are seen dead and bloodied or get killed offscreen by the monster.
The monster falls into a fan; we see its foot graphically cut off and blood spraying all over as it gets minced up.