BED BUGS Bed bugs are small, wingless insects that feed exclusively on the blood of warm-blooded animals. Humans are the preferred hosts for the two main bedbug species. There are two species of bedbugs that are known to feed on human blood. They are known scientifically as  Cimex lectularius  and  Cimex hemipterus . They have been found in the tombs of ancient Egyptians many years ago around 3,500. Over millions of years, bedbugs have evolved as nest parasites, inhabiting the nests of birds and the roosts of bats. Some of them have learned to adapt to the human environment. Newborn bed bugs, called hatchlings or nymphs, are tiny but visible and about the size of a poppy seed. Adults grow to about 0.25 inches long with an oval and flattened shape when they are not feeding. After feeding, they can double in size. Nymphs, eggs, and adults are visible to the naked eye. They are called bed bugs because of their preferred habitat in human habitations: like home sofas, bed mattress