Chapter 17: Introduction to Animals

Jellyfish at Monterey Bay Aquarium - picture by Charles Guest

Jellyfish at Monterey Bay Aquarium – picture by Charles Guest

Do you know what these orange, blob-like shapes are? Would it surprise you to learn that they are animals? They don’t look anything like the animals you are probably familiar with—animals such as dogs and deer, fish and frogs. But the greenish blobs are animals nonetheless. They belong to a phylum called Cnidaria, but you may know them as jellyfish. They are very simple animals and not fish at all. How can an organism as simple as a jellyfish be considered an animal? How are animals defined? What traits must an organism have to be classified in the animal kingdom? In this chapter, you will learn the answers to these questions. You will find out just what it means to be an animal.

Chapter Outline
17.1 Overview of Animals

Opening image copyright RAGMA IMAGES, 2010. http://www.shutterstock.com. Used under license from Shutterstock.com.

For Table in chapter 17, top to bottom,