Description: Jellyfish are marine invertebrates belonging to the Scyphozoan class. The body of an adult jellyfish is composed of a bell-shaped, jelly producing substance enclosing its internal structure, from which the creature's tentacles are suspended.

Habitats: Northern Australia, Papua New Guinea, Malaysia, Indonesia, the Philippines, Thailand and Vietnam

Behavior: Most jellyfish catch prey by the tentacles and fold the arm inward to bring the prey to the mouth.

Fatalities per year: 100

How to avoid: wear a sting-suit if swimming in areas where jellyfish live.

Our danger rating: 3/10 [ Vote and decide ]