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Provides detailed descriptions of the physical characteristics and behavior of dolphins.

Examines the habitat, intelligence, self-defense actions, and jet propulsion of this tentacled marine mollusk.

Explains the structures and functions of the central nervous system (brain and spinal cord) and the peripheral nervous system including the autonomic systems.

Describes the structures and functions of the respiratory and circulatory systems, including the lungs and airways, blood cells, the heart, arteries, veins, capillaries, pulmonary circulation and the lymphatic system.

Describes the human skeleton, major muscles of the body, the internal composition of bone, and the process of muscular contraction.

Describes the organs and their actions that are involved in the journey of food through the body and the acts of ovulation, fertilization, and reproduction.

Discusses the sense which enables some animals to detect their prey, search for food, signal danger, or find their way back to where they had been long ago.

Explores the sense of taste and how it functions in various animals, birds, insects, and fish.

Describes the physical characteristics, habitat, behavior, ancestors, and engineering abilities of these intelligent water-dwelling mammals.

Describes the physical characteristics, habitat, behavior, migration, ancestors, and predators of these efficient torpedo-shaped fish.

Describes the physical characteristics, habitat, behavior, and life cycle of these tiny, leaping parasites.

Describes the physical characteristics, habitat, behavior, and ancestors of spiders.

Describes the habitat, pruning habits, stomach processes, relatives, and ancestors of the tallest land animal in the world.

Describes the physical characteristics, habitat, behavior, and different kinds of these armored invertebrates.