Cimex lectularius

Typically found in human dwellings, hidden in cracks, crevices, mattress seams, and headboards near sleeping areas.

Obligate hematophages; they feed exclusively on the blood of warm-blooded animals, primarily humans.

Nocturnal and elusive; they use CO2 and heat to locate hosts. They undergo incomplete metamorphosis (egg, nymph, adult) and can survive months without feeding.

Risk: They cause itchy welts, allergic reactions, and significant psychological distress and insomnia. They are not known to transmit diseases but are a major nuisance pest. No ecosystem benefits in human environments.