The video shows some fantastic footage of dolphins flipping jellyfish out of the sea and into the air. It was recorded a few years ago off Tremadog Bay. Dolphins also eat some types of jellyfish so they will be welcoming the rise in supplies!
A group of jellyfish is called a bloom or swarm. They do not have a brain or central nervous system but a network of nerves.
Jellyfish are made up of more than 90% water and are fragile.
The lion’s mane jellyfish is the largest known species of jellyfish and they have a sting. Some have been spotted at Benllech beach on the Menai Strait according to the Marine Conservation Society. If you do get stung apply vinegar!