Serial killers aren't always creepy loners who live with their mothers -- sometimes they're seemingly average churchgoers with wives and kids. Criminal psychologists can get pretty darn close to figuring out what makes a serial killer tick -- even correctly predicting that Ted Bundy had a stepbrother. How much do you know about the history of serial killers -- and would you know one if he were living next door?
Question 1 of 10
A person has to murder five people to be considered a serial killer.
Question 2 of 10
There have been about 400 serial killers in the United States in the past century.
Question 3 of 10
The Green River Killer is considered to be the first serial killer in the United States.
Question 4 of 10
More than 95 percent of serial killers are male.
Question 5 of 10
Serial killer John Wayne Gacy was a precinct captain for his local Democratic party.
Question 6 of 10
David Berkowitz, aka "Son of Sam," was a "thrill killer," and Ted Bundy was a "lust killer."
Question 7 of 10
Serial killer Jeffrey Dahmer was the inspiration for the Buffalo Bill character in "Silence of the Lambs."
Question 8 of 10
Dennis Rader, convicted in 2005, was known as the BTK Killer. "BTK" stands for "beat, torture, kill."
Question 9 of 10
In childhood, serial killers often wet their beds, commit arson and exhibit cruelty to animals, behaviors known as the MacDonald triad.
Question 10 of 10