These can just as often be orange as purple ²

Pisaster ochraceus, generally known as the purple sea star, ochre sea star or ochre starfish, is a common starfish found among the waters of the Pacific Ocean. Identified as a keystone species, Pisaster is considered an important indicator for the health of the intertidal zone.

Sources and Credits

1. (c) John D Reynolds, all rights reserved, uploaded by John D Reynolds
2. Adapted by John D Reynolds from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Pisaster_ochraceus

More Info

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