Daniel A. Greenberg

Describes in detail the physical characteristics, behavior, and migration and life cycle of various kinds of whales, among the largest creatures ever known to have lived on Earth, and discusses the history of human interaction with these animals.

Describes the physical characteristics, behavior, hunting methods, and habitat of leopards.

Describes the physical characteristics, social behavior, hunting methods, and habitat of wolves.

Describes the physical characteristics, behavior, habitat, and various species of frogs.