The most alien creatures on Earth are right here in our oceans.

The Discomedusae, or "true jellyfish," represent some of the most ancient and successful life forms on Earth. These creatures have been swimming in Earth's oceans for over 500 million years, surviving mass extinctions and environmental changes that wiped out countless other species. The Herkles jellyfish, named for its impressive size and strength, can grow to over 2 meters in diameter and weigh up to 200 kilograms. Its translucent body, pulsing with bioluminescent light, represents the perfect adaptation to life in the deep ocean—a world of darkness, pressure, and mystery. Jellyfish are among the most efficient predators in the ocean, using their tentacles to capture prey with deadly precision. But they are also among the most beautiful creatures on Earth, their graceful movements and ethereal appearance inspiring artists and scientists alike. The jellyfish's simple body plan—essentially a bag of water with tentacles—has proven to be incredibly successful, allowing these creatures to thrive in every ocean on Earth. They represent the incredible diversity and adaptability of life, showing that beauty and efficiency can coexist in the most unexpected forms.