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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.

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

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