"In summertime so many jellies mob the waters of the Mediterranean Sea that it can appear to be blistering, and many bathers’ bodies don’t look much different: in 2006, the Spanish Red Cross treated 19,000 stung swimmers along the Costa Brava." It explains the threat they are to the human race and gives evidence about how Contact with the deadliest type, a box jellyfish native to northern Australian waters, can stop a person’s heart in three minutes. Jellyfish kill between 20 and 40 people a year in the Philippines alone.