As a species jellies have been around for a very long time. They appeared in the oceans about 650 million years ago, before the dinosaurs. They still populate our oceans today in a profusion of sizes and shapes. Jellyfish are incredible creatures - it's amazing that they are living things. Check it out...their bodies are made up of 95% water, they have no bones or cartilage, no heart or blood, and no brain! (Talk about a real 'no-brainer'). They are one of earth's simpler and more primitive life forms. The picture you see at left is a much smaller specimen of a lion's mane jelly. The world-record holder was found dead, washed up on a beach. It had a bell over seven feet across and its tentacles were over 120 feet long. That's even longer than the blue whale.
