Briefly describes ostriches, emus, cassowaries, and kiwis--flightless birds known as ratites--as well as another bird that cannot fly, the penguin.

Provides information about oysters, clams, scallops, and mussels--sea animals that live in shells.

A brief introduction to a number of extinct mammals that lived from the time of the dinosaurs to the late Ice Age.

Briefly describes the physical characteristics and behavior of dolphins and several related marine mammals, killer whales and porpoises.

Explains how tidal pools form and the types of plants and animals that inhabit them.

Compares the two arms and two legs that humans have with the limbs of other animals and how they are used.

Describes what roots look like and how they function in plants.

A simple description of the characteristics of spring.

Simple text and illustrations describe the differences between alligators and crocodiles.

Explains how the Dewey decimal system of classification for libraries was invented and how it works.