Pinworm

Natural Habitat

The human large intestine; eggs are commonly found on bedding, clothing, and household dust in indoor environments.

Diet & Feeding

Consumes intestinal contents and epithelial cells within the human digestive tract.

Behavior Patterns

Adult females migrate out of the anus at night to lay thousands of eggs in the perianal folds. This causes intense itching, leading the host to scratch and inadvertently transfer eggs to hands and surfaces.

Risks & Benefits

Risks include enterobiasis (pinworm infection), characterized by perianal itching, disturbed sleep, and irritability. While generally not dangerous, it is highly contagious among household members. There are no ecological benefits as they are obligate parasites.

Identified on: 3/28/2026