Bed bug (juvenile/nymph or fecal spot)

Primarily human dwellings, especially bedrooms; hiding in cracks and crevices of mattresses, bed frames, furniture, walls.

Exclusively feed on the blood of warm-blooded animals, primarily humans. Nymphs feed to molt.

Nocturnal, hiding during the day and emerging at night to feed. They are attracted to carbon dioxide and body heat. They can survive long periods without feeding.

Potential risks include itchy bites, allergic reactions, secondary skin infections from scratching, and significant psychological distress. They are not known to transmit diseases to humans. There are no direct benefits to humans or the ecosystem.