We often think of heavy animals as fairly solid; the blue whale, African elephants, and rhinos all seem fairly substantial because of their sheer volume. However, there is one creature that swims in Earth’s oceans that has its own heavy title, and yet is mainly made up of soft, squishy parts. Meet the lion’s mane jellyfish ( Cyanea capillata ). The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The lion’s mane jelly is a world record holder for being the heaviest jellyfish on Earth. Guinness World Records lists its estimated weight as 1 metric ton, making it by far the heaviest of all the jellies. The tentacles alone can grow to around 30.5 meters (100 feet), so long that they rival the length of the largest animal to have ever live

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