Jellyfish Fun FactsSome jellyfish can be very hard to see, nearly invisible to the human eye.A group of jellyfish is called a 'bloom', 'swarm', or 'smack'.Jellyfish don't have brains. Jellyfish are not actually fish, they are invertebrates - animals with no backbones. Jellyfish propel themselves forward by squirting water from their mouths. Some jellyfish are almost transparent, but others are vibrant in colour such as pink, yellow, blue, and purple.Jellyfish are considered a delicacy and are used in Chinese medicine. They live in the sea and are found in all ocean waters.Scientists have evidence these creatures have been floating along in the world's oceans for at least 500 million years!Jellyfish don't have a heart. The box jellyfish is probably the most venomous jellyfish in the world.Students read through the reading comprehension and learn some interesting facts about barrel jellyfish. There are 11 questions for them to answer.