Bed bug

Indoor cracks and crevices, especially seams of mattresses, bed frames, and nearby furniture.

Feeds on blood, usually human blood, and is most active at night.

Flat, oval, wingless insects that hide near sleeping areas and emerge to feed; females lay eggs in sheltered places.

Bites can cause itchy skin reactions, but bed bugs are not known to transmit disease. They are household pests with no meaningful ecological benefit indoors.