Cover -- Contents -- Acknowledgments -- Introduction -- 1 Introducing Frogs -- What are frogs? -- What is the difference between frogs and toads? -- What other types of amphibians are there? -- Why are frogs important? -- Where do frogs live? -- How many kinds of frogs are there? -- How are frogs classified into groups? -- What are frogs' closest relatives? -- When did frogs evolve? -- What is the oldest fossil frog? -- 2 Form and Function -- What are the largest and smallest living frogs? -- Why do so many frogs have long legs? -- Are frogs slimy? -- Are some frogs poisonous? -- Why do toads have so many bumps? -- Why is a frog's metabolism important? -- Do frogs have teeth? -- Do frogs sleep? -- Do frogs have ears and can they hear? -- How far can frogs jump? -- Can frogs climb? -- Can all frogs swim? -- Can frogs breathe under water? -- What is the sac under the frog's throat? -- 3 Frog Colors -- Why are frogs colored the way they are? -- What causes the different skin colors of frogs? -- What color are a frog's eyes? -- Do a frog's colors change as they grow? -- Do a frog's colors change under different conditions? -- Do all individuals of a single frog species look the same? -- 4 Frog Behavior -- Why do frogs make noise? -- How do frogs make sounds? -- Can frogs change their calls? -- Do all frogs make sounds? -- Are frogs social? -- Do frogs fight? -- Do any frogs fly or glide? -- How do some frogs stick to walls? -- How smart are frogs? -- Do frogs play? -- How do frogs defend themselves? -- Do any frogs bite to defend themselves? -- 5 Frog Ecology -- Which geographic regions have the most species of frogs? -- What types of frogs live in rain forests? -- What types of frogs live in deserts? -- Why do so few frogs live in large lakes? -- Do any frogs live in salt water? -- Do frogs migrate? -- How do frogs survive the winter?.

How do frogs survive droughts? -- Do frogs have enemies? -- How do frogs avoid predators? -- Do frogs get sick? -- How can you tell if a frog is sick? -- Are frogs good for the environment? -- 6 Reproduction and Development -- How do frogs reproduce? -- Do all frogs lay eggs? -- How many eggs do frogs lay? -- Where do frogs lay their eggs? -- How do frogs protect their eggs? -- Do frogs care for their young? -- Why do some frogs lay their eggs in strange places? -- Do all frogs have a tadpole stage? -- How many baby frogs grow to be adults? -- How fast do frogs grow? -- How is the sex of a frog determined during development? -- How can someone tell a frog's sex? -- How can you tell the age of a frog? -- How long do frogs live? -- 7 Food and Feeding -- What do frogs eat? -- Do frogs chew their food? -- Why do some frogs have such long tongues? -- How do frogs find food? -- Do frogs drink water? -- How do desert frogs keep from drying out? -- What do tadpoles eat? -- Why do tadpoles of some species eat their siblings? -- 8 Frogs and Humans -- Do frogs make good pets? -- Where can I get a pet frog? -- How do you take care of a pet frog? -- Are any species of frogs dangerous to humans? -- Do frogs feel pain? -- Why do toads urinate on people when they are picked up? -- How can I see frogs in the wild? -- 9 Frog Problems (from a human viewpoint) -- Why should people care about frogs? -- Are frogs pests? -- Do frogs have diseases and are they contagious to humans? -- Is it safe to eat frogs? -- Are frogs raised by humans for food? -- Can a person get high from licking or smoking a toad? -- Can toads cause warts in humans? -- How can frogs be used in research? -- 10 Human Problems (from a frog's viewpoint) -- Are any frogs endangered? -- Why are frog populations declining? -- Why are frogs disappearing from some parts of the world but not others?.

Are frogs affected by climate change? -- Are frogs affected by pollution? -- Are diseases causing frog populations to disappear? -- Why do some frogs have extra legs? -- How do roads affect frogs? -- Why are there no frogs living in the wetland or stream behind my house? -- What can an ordinary citizen do to help frogs? -- 11 Frogs in Stories and Literature -- What roles do frogs play in religion and mythology? -- What do frogs have to do with fiction or fairy tales? -- What roles do frogs play in native cultures? -- What roles do frogs play in modern or popular culture? -- What roles have frogs played in poetry and other literature? -- 12 "Frogology" -- Who studies frogs? -- Why do scientists study frogs? -- How do scientists study frogs? -- Which species are best known? -- Which species are least known? -- How do scientists tell frogs apart? -- Why do the scientific names and classification of frogs change frequently? -- Appendix A: Synonyms of Frog Scientific Names -- Appendix B: Resources, Organizations, and Societies for Frog and Toad Conservation -- Bibliography -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- R -- S -- T -- U -- V -- W -- X -- Y -- Z.