Ten real jellyfish in close view: moon jellyfish, lion's mane, compass jellyfish, mauve stinger, fried egg jellyfish, Pacific sea nettle, crown jellyfish, upside-down jellyfish, blue jellyfish and spotted lagoon jellyfish. Photograph credits: 1. File:Aurelia aurita (Cnidaria) Luc Viatour.jpg; Luc Viatour; CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:Aurelia_aurita_(Cnidaria)_Luc_Viatour.jpg; 2. File:Lion's mane jellyfish, or hair jelly, Cyanea capillata, the largest know jellyfish in Newfoundland, Canada. (21390221575).jpg; Derek Keats from Johannesburg, South Africa; CC BY 2.0; ; https://commons.wikimedia.org/wiki/File:Lion's_mane_jellyfish,_or_hair_jelly,_Cyanea_capillata,_the_largest_know_jellyfish_in_Newfoundland,_Canada._(21390221575).jpg; 3. File:Gandoli - Chrysaora hysoscella 03.JPG; Francesco Ranieri; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Gandoli_-_Chrysaora_hysoscella_03.JPG; 4. File:Pelagia noctiluca (Sardinia).jpg; Hans Hillewaert; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Pelagia_noctiluca_(Sardinia).jpg; 5. File:Medusa Cassiopea o Cassiopea Mediterranea (Cotylorhiza Tuberculata).jpg; Francesco Ranieri; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Medusa_Cassiopea_o_Cassiopea_Mediterranea_(Cotylorhiza_Tuberculata).jpg; 6. File:Chrysaora fuscescens Ripley's Aquarium of Canada 1.JPG; Gzzz; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Chrysaora_fuscescens_Ripley's_Aquarium_of_Canada_1.JPG; 7. File:Cephea cephea jellyfish.jpg; Juuyoh TANAKA; CC BY 2.0; ; https://commons.wikimedia.org/wiki/File:Cephea_cephea_jellyfish.jpg; 8. File:Cassiopea xamachana.jpg; No machine-readable author provided. Bastique assumed (based on copyright claims).; CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:Cassiopea_xamachana.jpg; 9. File:Blå brennmanet (Cyanea lamarckii).jpg; Erling Svensen/Ocean Photo; CC BY 4.0; ; https://commons.wikimedia.org/wiki/File:Blå_brennmanet_(Cyanea_lamarckii).jpg; 10. File:Mastigias papua - MBA - DSC07064.JPG; Daderot; CC0; ; https://commons.wikimedia.org/wiki/File:Mastigias_papua_-_MBA_-_DSC07064.JPG;