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

In this outdoor, warm weather activity, learners use sweepnets to search a grassy area such as a large lawn or field, collecting small animals to find as many different kinds of animals as possible.

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

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.