There are many species of box jellyfish, some of which are very small. Regardless of their meager size, they are able to deliver millions of poisonous stings that can stop a grown human s heart. Read on to discover what makes the terrifying yet beautiful box jellyfish one of the deadliest creatures in the sea.

A deadly encounter -- All about jellyfish -- Meet a deadly jellyfish -- The big stinger -- Millions of stings -- Stings for attack and defense -- Humans and box jellyfish -- A lucky escape -- Tiny, invisible stingers -- Irukandji syndrome -- The oh boy! jellyfish -- The lion's mane jellyfish -- Staying safe.