Did you know? There are about 300 species of sea pens that can be found swaying on the ocean floor a

Did you know? There are about 300 species of sea pens that can be found swaying on the ocean floor around the world.

You might be surprised to find out that this feather-like structure is actually a colony of polyps that work together to survive. Different polyps have different responsibilities depending on their location on the body. There are feeding polyps that catch plankton, as well as polyps that circulate water to keep the colony balanced and upright.

Photo: Richard Ling, CC BY-NC-ND 2.0, flickr; kidney sea pens (Sarcoptilus grandis) pictured

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