1. Build background.
Show students the photo gallery of emperor penguins. Discuss the physical characteristics of penguins and how their anatomy enables them to be adept at swimming and diving through icy water. Point out the following physical characteristics:

• streamlined shape
• solid, heavy bones
• stubby, stiff wings

2. Watch the video.
Watch the Crittercam segment "Fishing With Emperor Penguins" from Wild Chronicles. Ask students to notice and describe how skillfully the penguins swim and dive.

3. Divide students into small groups and distribute the worksheet.
Divide students into small groups, and give each a copy of the worksheet Penguins: Which Body Shape Dives Best? Have each group build an experimental vertical diving chamber using at least five, two-liter plastic bottles with tops and bottoms cut off, taped end-to-end, and filled with water. Have students use modeling clay to build four solid geometric shapes: cube, sphere, 3-D rectangle, and cylinder. Then have students use a scale to make sure each shape weighs the same amount.

4. Have students conduct an experiment.
Have each group predict which of the four shapes will dive the fastest to the bottom of the chamber. Then have students drop each shape into the chamber, time the descent of each, and record the results on the worksheet. Have students conduct three trials for each shape and then average the results.

5. Have students analyze the results.

6. Repeat the experiment.
Have students repeat the procedure, this time using the clay to make models of actual animals—including humans.

### Extending the Learning

Have students float two plastic containers in water. Fill one halfway with sand. Now push down slowly on both containers with equal force. Which container is easier to push down? Have students relate this experiment to what they just learned in order to make connections about why it is easier for heavy-bodied penguins to dive and stay underwater than it is for lighter birds.

#### Learning Objectives

Students will:

• describe the physical characteristics of penguins that enable them to swim and dive in icy water
• build a simulation of a vertical diving chamber
• make predictions about results and record actual results in trials

#### Teaching Approach

• Learning-for-use

#### Teaching Methods

• Discussions
• Hands-on learning
• Visual instruction

#### Skills Summary

This activity targets the following skills:

• Critical Thinking Skills
• Applying
• Understanding

### Connections to National Standards, Principles, and Practices

#### National Geography Standards

• Standard 8:  The characteristics and spatial distribution of ecosystems and biomes on Earth's surface

### What You’ll Need

#### Materials You Provide

• 2-liter plastic bottles, tops and bottoms cut off
• Modeling clay
• Pencils
• Scale
• Transparent tape
• Water

#### Required Technology

• Internet Access: Required
• Tech Setup: 1 computer per classroom, Projector, Speakers
• Plug-Ins: Flash

• Classroom

#### Grouping

• Small-group instruction

### Background Information

Penguins can swim faster and dive deeper than any other bird. They have solid, heavy bones instead of hollow bones filled with air. They have stubby, stiff wings instead of long, flexible wings.

• None

• None

### Vocabulary

anatomy
Noun

structure of an organism.

physical characteristic
Noun

physical feature of an organism or object.

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