All photos I took at Wonders of Wildlife in Springfield Missouri
Jellyfish have floated along ocean currents for millions of years, even before dinosaurs walked this earth. They are abundant in cold and warm ocean water, in deep water, and along coastlines. Despite their name, jellyfish aren't actually fish—they're plankton. These invertebrates with their gelatinous bodies can be microscopic, single-celled organisms, while others are several feet long. Jellyfish can range in size from less than an inch to nearly 7 feet long, with tentacles up to 100 feet long.
Jellyfish are also members of the phylum Cnidaria, and the class Scyphozoa. The jellyfish's cnidarian relatives include corals, sea anemones and the Portuguese man-o'-war. All cnidarians have a mouth in the center of their bodies, surrounded by tentacles. Their diet includes fish eggs or any fish that they can wrap themselves around. Jellyfish are about 98 percent water. Most are transparent and bell-shaped. Jellyfish are very simple they don't have bones, a brain or a heart. To see light, detect smells and orient themselves, they have rudimentary sensory nerves at the base of their tentacles. Though they are simple this doesnt affect the beauty that these fascinating creatures hold.
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https://animals.howstuffworks.com/marine-life/jellyfish.htm