The ecological perspective of Zoology is stressed throughout chapters 1 to 22. Human population and endangered species statistics have been updated. Ecological problems are discussed including an assessment of eight critical environmental processes: biodiversity loss, nitrogen cycling, phosphorus cycling, climate change, ocean acidification, land and freshwater use, and ozone depletion.

This edition offers:

• Connect® with auto-gradable and interactive assessment material tied to learning outcomes
• A SmartBook® adaptive eBook that creates a personalized reading experience for each student (available in Connect)
• A downloadable eBook available through ConnectED