Most real monsters are either microscopic or barely visible.
Stromodeum of a canine intestinal roundworm (the nematode Toxocara canis). The stomodeum is the mouth and lip region of a nematode.
Toxocara canis is the cause of toxocariasis (visceral larva migrans) in humans. It is a zoonotic parasitic infection caused by oral contact with material contaminated by Toxocara eggs in dog feces.
Once eggs have been Ingested, they hatch into larvae in the intestines, then migrate through the tissues to organs such as the liver, lungs, brain and eyes.
The migrating larvae may cause anything from mild malaise to asthma, seizures, pneumonia and blindness. [source]
Animalia > Eumetazoa > Bilateria > Phylum Nematoda >
Class: Secernentea > Order: Ascaridida > Family: Toxocaridae >