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This activity (on pages 35-43) lets learners analyze a "herd of elk" to detect the spread of a bacterial disease called brucellosis.

In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

Learners use a variety of beans to represent a variety of species, and scatter these beans over a large piece of paper representing the environment.

This laboratory activity helps learners understand the concept of biological succession by simulating the process in a microenvironment with various protozoans.

In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.

In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.

In this activity, learners sample a star field to estimate the number of stars in the universe.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

In this field study, learners discover how to collect data in the field and how their efforts can help certain animals, specifically, amphibians.