Bloom of moon jellyfish swimming at night in Prince William Sound, Alaska, USA (@ Hiroya Minakuchi/Minden Pictures)
- Aurelia aurita can be recognised by its four horseshoe-shaped testicles.""No wonder people are scared of them
- They have no heart, no blood and no brains.""So how do these creatures survive?
- Surely only some sort of monster would eat a jellyfish.""Who are you calling a monster?
- When swimming in a lake, it\s best not to touch these.""You\ll need a miracle to avoid them in this one