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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 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 activity, learners will construct a measuring device (snake "string") to improve their observation skills.

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.

Using a real-size sketch of a baby elephant's footprint, learners estimate, measure and record the width (diameter) and outside edge length (perimeter or circumference) of the footprint.