World's 7 Most Dangerous Female Serial Killers

 Here are the most horrifying and ruthless female serial killers in history.As per the United Nations Office on Drugs and Crime, men make up 90% of homicide perpetrators globally. Even though women count only for around 10% of killers, they are just as deadly. Here are the most horrifying and ruthless female serial killers in history.

Belle Gunness

Widowed twice, at first glance, Belle Gunness seems haunted by tragedies. A Norwegian immigrant in La Porte, Indiana, in the 1900s she murdered as many as 40 people including her husbands, her foster daughter and many men she would attract by posting lonely-heart ads in newspapers.

Amelia Dyer

She worked at a "baby farm" and reportedly killed hundreds of infants and children. The exact number is unknown, but it is suspected that she murdered over 400. For her crimes, she was hanged in 1896.

Joanna Dennehy

Over the course of 10 days in March 2013, she went on a murder spree and killed three men for "fun". Reportedly, Dennehy had hoped to kill more but was caught and sentenced to life in prison.

Elizabeth Bathory

Known as "Blood Countess," between 1590 and 1610, the Hungarian noblewoman tortured and murdered as many as 650 girls and young women.

Darya Nikolayevna Saltykova

An 18th-century Russian noblewoman, Saltykova would torture and beat up peasant girls working for her. As per reports, she is responsible for killing more than 100 of her staff.

Juana Barraza

A Mexican wrestler, Juana Barraza came to be known as the "The Old Lady Killer". She murdered around 42 to 48 elderly women. She was caught in 2006 and in 2008 was sentenced to 759 years in prison.

Gesche Gottfried

Between 1813 and 1827, in Germany, Gesche Gottfried killed 15 people, including her husband, fiancé and children, using arsenic. She was publicly executed for her crimes. She was actually the last person publicly executed in the city of Bremen.