Bed bugs (Cimex lectularius) are insects that feed on blood, normally biting humans at night.
Adult bed bugs are approximately 5-7mm long and resemble an apple seed. The bugs are oval shaped, very flat and brown to reddish brown although after a blood meal bed bugs will plump and develop a deeper red colour.
Each of the five bed bug nymphal stages is a smaller version of the adult and requires a blood meal to moult. Eggs are pearly white and 1mm long.