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

Millions of organisms can live in and around a body of water.

In this two-part outdoor activity, learners conduct a population census of squirting clams on a beach or mudflat, and investigate the clams' natural history.

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

In this outdoor activity, learners simulate an oil spill using popcorn (both oil and popcorn float on water), and estimate the spill's impact on the environment.

In this outdoor activity, learners measure familiar objects in nature to practice working with the metric system.