The mammal world -- Making sense of mammals -- The evolution of mammals -- The mammals diversify -- Mammal senses -- Flying mammals -- Furry coats -- Hiding in the open -- A spiny coat -- Designs for defense -- What is a tail for? -- An early birth -- Fast breeders -- Nine lives -- Unique to mammals -- Growing up -- The game of life -- Keeping clean -- How to deal with a meal -- Grippers and grinders -- Food for later -- At home in a nest -- Life underground -- How many toes? -- Tracks and trails -- Mammal detective -- Mammal classification.