Marine biologists sometimes refer to pyrosomes as the unicorns of the sea — creatures so mysterious and elusive that they're almost mythical.
Pyrosomes are actually not individual creatures, but colonies made up of thousands of individual pyrosome clones. These clonal colonies can be as small as a pencil eraser, but larger colonies may grow up to 60 feet (18 meters) in length.
Like many large sea creatures (such as whale sharks), pyrosomes are filter feeders that take in seawater containing the plankton on which they feed. After they've consumed the plankton, they push out the filtered water.
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