Family vacation in the Wadden Sea National Park – there are countless things to discover. A true paradise – not only, but especially for children. Lisa visits her cousin Jonas in Dornumersiel. Jonas has planned a colorful program for their shared holiday, and together they explore the Wadden Sea, the salt marshes, and venture out on a fishing cutter to the East Frisian Islands. Why is the mudflat only dry at certain times? And what does the lugworm do at high tide – where exactly does it live, and how does it get air in the mud? What exactly are salt marshes, and how can it be that samphire grows wonderfully while my houseplant sadly dies when watered with saltwater? The handbook for young mudflat researchers addresses all these questions and introduces children to the fascinating habitat of the Wadden Sea in a playful way. With clearly described experiments, little explorers can marvel at what makes the salt marsh so unique, understand and explore who lives in the mud, how the inhabitants feed themselves, and how they have adapted to a life with constantly changing tides. In addition to small hands-on experiments and observations, the mudflat researchers will also find numerous suggestions and instructions on what they can create with collected beach treasures. Through the excursions of Lisa and Jonas, they will be inspired with countless ideas to become active themselves and be fascinated by the unique wildlife and plant life in the Wadden Sea National Park.