They can thrive in warm and cold waters, along coastlines or out in the deep. Their bodies are made up of around 95 percent water. Even though they have no brains, jellyfish have somehow been smart enough to survive for over 500 million years.

Blubber Jellyfish   © Samuel J Shelton

The Blue Blubber Jellyfish (Castostylus mosaicus) is common along the east coast of Australia from shallow seas to estuarine waters. Their recognized blue color comes from their symbiotic relationship with algal plant cells that are kept inside its body.

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