Jellyfish have populated the seas for over 500 million years, and have no brains, hearts or blood. They come in many amazing forms – we picked some of our favourite photos from robertharding.com

Mass of Crystal Jellyfish or Moon Jellyfish (Aurelia aurita), Kiel Fjord, Germany, Europe

Mass of Crystal Jellyfish or Moon Jellyfish, Kiel Fjord, Germany

Scuba diver watches Moon Jellyfish, Aurelia aurita, Egypt, Sha´ab Shouna, Red Sea

Scuba diver watches Moon Jellyfish, Aurelia aurita, Egypt, Sha´ab Shouna, Red Sea

Blue Button (Porpita porpita), Jellyfish with clear cound, blue disc with tentacles extended, Cayman Brac rockpool, Cayman Islands, Caribbean

Blue Button, Cayman Islands, Caribbean

Blue Bottle Jellyfish

Blue Bottle Jellyfish

A small group of jellyfish floating in water

A small group of jellyfish floating in water

Lion's mane jellyfish, Alaska Pacifi Ocean

Lion’s mane jellyfish, Alaska Pacific Ocean

A jellyfish floating in the water

A jellyfish floating in the water

See more photos of Jellyfish

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