As one of the worst nuisance insects, bed bugs can be one of the most intimidating Ectoparasites. Bed bugs are small oval-shaped bugs that take refuge in beds and feed on humans while they sleep. Bed bugs are slow moving and cannot fly.   They often get around by hitch hiking on people, their clothes, and other items they may carry, spreading easily by latching onto suitcases, clothes, and linens! Signs of bed bug infestation include insect skin casings. Some people may also notice small bites on the arms and legs which can sometimes swell and itch. Reddish-brown fecal spots on mattresses or walls are another common sign of bed bugs.