5
Scorpions
www.arkive.org
Known as one of the oldest creatures to ever live on earth, scorpions evolved from sea-dwelling creatures to land menaces about 340 million years ago. Around 1,300 to 2,000 species of scorpions exist in the world but only 25 of them have poison that is dangerous enough to kill humans. Nevertheless, anywhere between 1,000 to 5,000 people are killed by scorpions annually.
4
Snakes
www.bbc.co.uk
If you fear snakes, your fear is not unmerited. Snakes kill an average of 50,000 people around the world every year. Most deaths are said to come from snakes that are threatened by mere human presence and activity.
3
Tsetse flies
commons.wikimedia.org
The Tsetse fly is responsible for spreading the African sleeping sickness, which affects as many as 500,000 people, 80 percent of whom eventually die.
2
Mosquitoes
npic.orst.edu
Mosquitoes may be one of the smallest on this list, but they are among the deadliest. These insects are carriers of fatal diseases such as malaria and dengue, which kill around 660,000 to 1,000,000 people every year.
1
Humans
my.opera.com
Although this is probably the most predictable finale in history, there really is nobody better at killing us than we are.
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