Life in the estuary is always changing. Ocean tides of salt water flow in and out of the estuary and mix with the fresh water that flows from rivers and streams. The animals that swim or wade in the waters or make the mudflats their homes must have physical or social adaptations that allow them to live in the salty mix. Discover how and why animals survive and thrive in these sheltered biomes! This nonfiction book explores the wildlife found in brackish estuary biomes--part of the Fauna del bioma series. Fun Children's Book Features: This Spanish science book supports NGSS standards and includes a glossary, index, comprehension questions, and a reading activity to encourage further learning and reading comprehension skills. 32 pages with vibrant photographs and sidebars Guided reading level O About Rourke Educational Media: We proudly publish respectful and relevant nonfiction and fiction titles that represent our diverse readers, and are designed to support reading on a level that has no limits!