Anemone, San Diego
Aggregating Anemone (Anthopleura elegantissima) One of the most abundant intertidal animals on the Pacific coast — it reproduces by cloning itself, carpeting rocks with genetically identical colonies that wage slow-motion border wars against neighboring clones. Extremely common year-round in San Diego tidepools, found from Alaska to Baja California on rocky shorelines exposed at low tide. Wikipedia | iNaturalist