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Vernal pools or seasonal pools fill with rain water during the spring and support a variety of life for a short season. Fairy Shrimp: Tiny, translucent freshwater shrimp live in these pools. They lay eggs which survive during the dry season, and hatch when the pools refill with water. Plants: Quillworts, Liverworts and Stonecrops colonize the gravel at the bottom of the pools. As these die, they enrich the soil. Over time sedges, wildflowers, grasses and cactus grow in the pools. Enchanted Rock State Natural Area, Texas.