Two fat purple holothurians on a mud/sand bottom

Two fat purple holothurians on a mud/sand bottom. How do like species find each other or even come into close proximity in the eternal darkness of the seafloor? Why are they purple in a lightless environment?

Photo Location: Gulf of Mexico, North

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Author: NOAA Okeanos Explorer Program, Gulf of Mexico 2012 Expedition/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	16th October 2015
Viewed	10 viewed