Heather Moore Niver 
When Monkeys Laugh [PDF ebook] 

Different people find different things funny. Monkeys have been compared to humans in many ways, but this volume explores what makes a monkey chuckle. Readers will learn about the emotions behind a monkey’s laughter. Is their panting as they play an indication that they are having fun? Do chimpanzees laugh when they are tickled? Readers won’t be able to suppress a smile as they learn all about the side-splitting sides of a monkey’s emotions. Full-color photos will show monkeys at their funniest. A "Words to Know" section will help them master new vocabulary. "Further Reading" will inspire readers to learn more about animals and their emotions.