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Jellyfish, also known as sea jellies, are the medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a
Learn about jellyfish, the ancient invertebrates that float on ocean currents and sting their prey. Find out how they eat, where they live, and why they are sometimes dangerous to humans.
Jun 20, 2024 · Learn about jellyfish, marine invertebrates with about 200 species, some of which have stinging cells and others that are sessile or filter feed. Find out how they reproduce, where they live, and what threats they face.
- The Editors of Encyclopaedia Britannica
Oct 4, 2018 · How much do you really know about jellyfish? Given their diverse evolutionary history, jellies exhibit a fantastic range of shapes, sizes, and behaviors. Learn all about these squishy,...
- 4 min
- 4.5M
- Nat Geo WILD
- Jellyfish Could Be Older Than Dinosaurs
- They're Adapting Well to Climate Change
- They Aren't Really Fish
- Jellyfish Are 98% Water
- They Can Have Eyes
- Some Jellyfish Might Be Immortal
- They Eat Where They Poop
- They Rarely Travel in Groups
- They Are Among Earth's Deadliest Creatures
- Jellyfish Can Be Tiny Or Enormous
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Jellyfish have no bones, so fossils are hard to come by. Nevertheless, scientists have evidence these creatures have been bobbing along in the world's oceans for at least 500 million years. In fact, it's likely the jellyfish lineage goes back even further, possibly 700 million years.That's roughly three times the age of the first dinosaurs. Some of...
Unlike most marine creatures, jellyfish are thriving in our oceans despite marine heat waves, ocean acidification, overfishing, and various other human influences. While corals, oysters, and any marine organisms that build shells are considered the biggest losers of increasingly acidic oceans, jellyfish don't seem to be as susceptible. But as the c...
One look at a jellyfish and this might seem rather obvious, but they aren't actually fish. They are invertebrates from the phylum Cnidariaand are so varied as a taxonomic group that many scientists have taken to simply referring to them as "gelatinous zooplankton." Jellyfish do not have scales, gills, or fins like fish. Instead, they swim by openin...
The human body is composed of 60% water and the jellyfish's 98%. When they wash ashore, they can disappear after just a few hours, their bodies promptly evaporating into the air. They have a rudimentary nervous system, a loose network of nerves located in the epidermis called a "nerve net," and no brain. They also don't have a heart; their gelatino...
Despite their simple body design, some jellyfish have vision. In fact, for a few species, their vision can be surprisingly complex. For instance, the box jellyfish has 24 "eyes," two of which are capable of seeing in color. It's also believed this animal's complicated array of visual sensors makes it one of the few creatures in the world to have a ...
At least one species of jellyfish, Turritopsis nutricula, may be able to cheat death. When threatened, this species is capable of undergoing cellular transdifferentiation, a process whereby the organism's cells essentially become new again. This jellyfish is colloquially called the "immortal" jellyfish and it inhabits the warm waters of the Caribbe...
It might not sound very appetizing, but jellyfish don't use separate orifices for eating and pooping. They have one orifice that does the job of both the mouth and the anus. The jellyfish is known as a simple or "primitive" animal, and its lack of a dual-hole system—which developed way down the line of evolution—is proof of that. Still, the multifu...
Many refer to a group of jellyfish as a bloom or a swarm, but they can also be called a "smack." In any case, seeing a group of jellyfish is rare considering these animals are mostly lone drifters. They're solitary animals, only clumping together when they're all following a singular food source or because they're traveling in the same water curren...
All jellyfish have nematocysts, or stinging structures, but the power of their stings can vary widely depending on the species. The most venomous jellyfish in the worldis probably the box jellyfish, capable of killing an adult human in just a few minutes with a single sting. Each box jellyfish reportedly carries enough venom to kill more than 60 hu...
Some jellyfish are so tiny they are practically invisible floating in the ocean's currents. The smallest are those in the genera Staurocladia and Eleutheria, which have bell disks from just 0.5 millimeters to a few millimeters in diameter. By contrast, the lion's mane jellyfish, Cyanea capillata, can extend its tentacles as far as 120 feet. The wor...
Learn about the ancient, diverse, and adaptable jellyfish, from their possible immortality to their deadly stings. Discover how they cope with climate change, vision, and more in this article by Treehugger.
Oct 29, 2009 · Explore the diversity and beauty of jellyfish, the ancient invertebrates that thrive in all ocean habitats. See stunning images of mosaic, moon, and other jellyfish species.
Jellyfish facts for kids: learn all about these incredible invertebrates, with facts about jellyfish size, habitat characteristics, behaviour and diet.
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