Final answer:
Pill bug females carry their eggs in a specialized pouch called a marsupium.
Step-by-step explanation:
Pill bug females, also known as sow bugs or woodlice, carry their eggs in a special pouch called a marsupium. They have a ventral brood pouch on the underside of their bodies where they keep the eggs. The marsupium provides protection and moisture for the developing eggs until they hatch into tiny pill bug nymphs.