The notion of the "big, bad wolf" has done a lot of damage to our planet. Wolves are keystone predators. Their absence from the ecosystem has devasting consequences for humans and animals alike. Their presence ensures a vast variety of plant and animal life. This book explains what a keystone species is and why they're so important. It also breaks down the concept of trophic cascade using familiar species. Stunning full color pictures depict wolves and their habitat. Fun fact boxes and age-appropriate vocabulary make learning about our natural world fun.