Gray, Susan Heinrichs

Presents an introduction to the human circulatory system, explaining what it is and how it works, and looking at the connections between the heart, lungs, and blood.

Examines the origins, appearance, personality, and behaviors of Scottish terriers, and includes photographs, and tips on training and care.

Examines the origins, appearance, personality, and behaviors of beagles, and includes photographs, and tips on training and care.

Offers an overview of the natural history, physical characteristics, behavior, and conservation of the California condor.

Offers an overview of the natural history, distribution, physical characteristics, behavior, and conservation of the bald eagle.

Describes the characteristics, behaviors, and life cycles of Karner blue butterflies, explains how the loss of lupine habitats led the species to the brink of extinction, and discusses how government workers, scientists, and public sector groups worked to restore Karner blue butterfly populations.

Presents an introduction to the human skeletal system, explaining what it is and how it works, looking at the the inside of a bone, and discussing healthy and unhealthy skeletons.

Presents an introduction to the human respiratory system, explaining what it is and how it works, looking at the role of blood in the respiratory system, and discussing why breathing problems occur.

Presents an introduction to the human muscular system, explaining what it is and how it works, looking at the parts of a muscle, and discussing healthy and unhealthy muscles.

Presents an introduction to the human digestive system, explaining what it is and how it works, looking at the different parts of the digestive system, and discussing why people get upset stomachs.