They’re flat, they’re round, they're reddish-brown, and they feed on human blood: bed bugs. These tiny creepy-crawlers are attracted to humans by their body heat and the carbon dioxide in their breath. Their bites leave itchy, little bumps on the body that resemble mosquito bites or hives. Despite their name, bed bugs are not exclusive to the bedroom. They have been found in movie theaters, retail stores, hotels, restaurants and airplanes and airports.