Gans, Roma

Describes how and why animals shed their feathers, hair, shells, horns etc., with emphasis on the molting of birds.

Briefly discusses how oil is formed, how it is recovered from the ground, and its many uses.

Describes the general migratory and feeding habits of the hummingbird emphasizing the amount of fuel necessary to sustain the small high-powered body weighing less than a penny.

Describes eyes, feet, and feathers in their roles as protective features for sleeping birds.

Explains how to start a rock collection and how to recognize igneous, metamorphic, and sedimentary rocks.

A simple introduction to caves, their formation, past uses, and distinguishing features.

Explains how icebergs are formed from glaciers, move into the ocean, create hazards to ships, and sometimes melt away.

Explains how to start a rock collection and how to recognize igneous, metamorphic, and sedimentary rocks.

Explores the mysteries of bird migration, including theories on how birds find their way and how scientists learn about migration.