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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 activity/field trip, learners investigate organisms that live along the ocean's rocky coast.

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 game, learners simulate a herd of deer trying to survive in an area called the "home range." Learners explore the concept of "carrying capacity"—what size population of an organism can

In this creative outdoor activity, learners invent populations of make-believe organisms and then investigate real populations living in the activity site.