Susan Heinrichs Gray

Briefly describes the climate, land formations, plant life, and animals of the frozen arctic land called tundra.

Briefly describes different types of grasslands, their plant and animal life, and environmental threats.

Looks at the qualities of zebra mussels and examines how they became an invasive species in Western Europe and the United States, how they cause problems in their new environments, and the ways that people have attempted to deal with them.

Presents the history of and developments in the field of emergency care and profiles individuals who have made lasting contributions to the field.

Introduces readers to the invasive Australian Spotted Jellyfish, a major threat to the shrimp fishery. Covers the concepts of invasive species and teaches about the cause, effect, and control of this dangerous creature. Includes sidebars, color photographs, and a map.

Provides information about the history of Mongolian wild horses and describes their physical appearance and behaviors. Discusses their extinction in the wild by 1970 and the plan developed by experts to increase their numbers. Includes additional aside information and questions.

Describes important developments in disease control throughout history and profiles scientists that have made lasting contributions to the field.

Examines the characteristics, behavior, and habitat of nudibranch sea slugs.

Describes the life of the gray whale, focusing on its physical characteristics, behaviors, migration, and reproduction. Explains why gray whales were placed on the endangered species list because of human hunters. This text provides information on what has been done to curb hunting and help the mammal get off the endangered list.

Examines the biology, range, and special characteristics of Karner blue butterflies, and explores what steps are being taken to ensure their survival.