Pinworm

Natural Habitat

The human large intestine, specifically the cecum and appendix area.

Diet & Feeding

Intestinal contents and bacteria within the human host.

Behavior Patterns

The adult female migrates out of the anus at night to deposit thousands of eggs in the perianal folds, causing intense itching. Eggs are infectious for 2 to 3 weeks.

Risks & Benefits

Causes enterobiasis, characterized by perianal itching and restless sleep. While not typically dangerous, they are highly contagious within households. There are no ecological benefits to humans.

Identified on: 2/9/2026