What's the difference?

The reader must spot the differences between pairs of nearly identical photographs.

"Introduces the reader to frogs and toads."--Provided by publisher.

"Introduces the reader to butterflies and moths"--Provided by publisher.

"Introduces the reader to turtles and tortoises."--Provided by publisher.

"Introduces the reader to crocodiles and alligators."--Provided by publisher.

"Introduces the reader to monkeys and apes."--Provided by publisher.

"Introduces the reader to cheetahs and leopards"--Provided by publisher.

Text and illustrations show differences between clothes, houses, shops, and transportation over the last 100 years.