The given facts about the bed bugs must be known by everyone are: 1. These are oval and are 4-5 mm long. These are the fastest runners among all other insects. 2. Bed bugs are wingless and can multiply very fast. 3. They are brown and turn reddish-brown after sucking human blood. 4. Bed bugs are very thin and they turn round after sucking blood 5. They are found in warm places and get attracted to Carbon Dioxide that humans exhale.