"In this poetic picture book, two curious siblings observe the hidden world of a vernal pool: a special kind of puddle habitat that pops up in the spring, dries up by summer, reappears in the fall, freezes over in the winter -- only to come back again in the spring. Linda's buoyant text is nothing short of an anthem for these "now-you-see-me, now-you-don't" wetland habitats, encouraging young naturalists and future water stewards to listen, watch...