By Manish Choudhary
Has venomous spines, found in the Indo-Pacific, can cause serious pain and tissue damage if stepped on.
Extremely venomous, found in the Indo-Pacific, can cause heart failure and death if stung.
Contains a deadly toxin, found in some parts of the world, can be fatal if eaten unless prepared carefully.
Has venomous spines, invasive in the Caribbean, can cause pain and sickness if stung.
Lives in the Amazon, can give powerful electric shocks, which can harm but usually not kill humans.
A small Amazon fish that can swim into human bodily openings, causing pain and health issues.
Lives in Africa's rivers, large and aggressive, can attack and injure humans.
One of the biggest sharks, known for rare but sometimes fatal attacks on humans.
Found in warm oceans, has sharp teeth, rare but can bite humans causing deep wounds.
Lives in African rivers, aggressive and can bite humans, especially in unfamiliar areas.