Jellyfish are important components of marine ecosystems

Gelatinous marine animals are found in oceans around the world. Jellyfish have umbrella-shaped bells and rear tentacles that contain stinging cells called nematocysts, which they use to capture prey and defend themselves. They come in a variety of sizes, shapes and colors, from small and transparent to large and colorful species. Some jellyfish are harmless to humans, while others can deliver painful stings, and a few species are deadly. Despite their delicate appearance, jellyfish are important components of marine ecosystems, serving as food for a variety of predators and playing a role in nutrient cycling.