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In this outdoor activity, learners find, count and compare as many different kinds of animals as they can find in two different areas: a managed lawn and a weedy area.

In this activity, learners investigate feeding relationships. Learners complete a food web and then make a mobile to represent a food chain.

Learners create a model of a wetland to observe how it absorbs and filters water from the environment.

In this matching game, learners study the limits of life on Earth to see what other places in the solar system might sustain microbial life.

In this outdoor activity/field trip, learners explore the concept of population density.

In this outdoor simulation game, learners search for pretend animals called "sticklers" to determine and map where they live (habitat) and how spread out they are in that area (distribution).

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

In this two-part activity about the connection between the lupine plant and butterflies, learners first read "Miss Rumphius," a storybook about lupine by Barbara Cooney.

In this outdoor activity, learners use a "litter-critter" wheel to help them identify different animals they find living in a natural litter habitat.

In this group activity, learners will explore the characteristics, functions and uniqueness of the mangrove tree.

In this outdoor activity, learners go "can fishing" and discover the kinds of aquatic organisms that live in and on submerged cans.

In this data analysis and environmental science activity, learners examine the effects of pollution on amphipods using data from the Chesapeake Ecotox Research Program.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.

In this outdoor activity/field trip, learners locate and study plants and animals in several freshwater pond habitats.