Bed bug

Indoor environments, particularly in and around sleeping areas such as mattresses, bed frames, and floorboards.

Obligate hematophagous (blood-eaters), primarily feeding on human blood but will feed on other warm-blooded animals if necessary.

Mainly nocturnal; they hide in dark crevices during the day and emerge at night to feed. They reproduce quickly and can survive several months without food.

No known benefits. Risks include itchy skin reactions, allergic responses, sleeplessness, and anxiety. They are not known to transmit diseases to humans but are difficult and expensive to eradicate.