Science | bedbugs 5 Creepy Facts About Bedbugs They have a smell...that comes from their feces By Evann Gastaldo Posted Jul 31, 2010 9:29 AM CDT Copied In this undated photo released July 24, 2001, by the University of Florida, a common bedbug is engorged with blood after feeding on a human. (AP Photo/University of Florida, File) Bedbugs are back in a big way, with infestations closing at least two stores in New York City recently. AOL News lists five things you should know about these creepy crawlers: They smell: If you can smell their sweet, musky scent, chances are you’ve already got an infestation on your hands. Even grosser: The scent comes from their feces. They’re healthy: At least, their immune system is—they’re the only known insects with a specialized immune organ, so good luck getting rid of them. They can be useful: Since they feed on human blood, bedbugs at the scene of a crime can offer DNA evidence. For the complete list, including more than you wanted to know about their kinky sex practices, click here. Read These Next Gavin Newsom has filed a massive lawsuit against Fox News. White House rolls with Trump's 'daddy' nickname. New Fox star, 23, misses first day after car troubles. New York Times ranks the best movies of the 21st century. Report an error