Pinworm

Natural Habitat

Human large intestine (specifically the cecum and appendix); eggs are often found on perianal skin and household surfaces.

Diet & Feeding

Feeds on intestinal contents and mucosal cells within the human gastrointestinal tract.

Behavior Patterns

Adult females migrate out of the anus at night to deposit thousands of eggs on the surrounding skin, causing intense itching. The life cycle is completed when eggs are ingested via contaminated hands or surfaces.

Risks & Benefits

Causes enterobiasis, characterized by perianal itching and restless sleep. While not typically dangerous, they are highly contagious and can lead to secondary skin infections from scratching. They offer no ecological benefits to humans.

Identified on: 2/27/2026