Readers are shown evidence of animal adaptation and the complexity of the food chain in this book, and the major impact one unchecked species can have on human life and the environment.
Plankton tries hard to get Mister Mussel to return a friendly greeting, but when Mussel finally opens his mouth the results are unfortunate for Plankton.
Explains what zebra mussels are, how they form, and how and where they live, looks at how zebra mussels spread beyond their native habitats, and discusses the problems caused by invading zebra mussels and what is being done to control the spread.
