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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, warm weather activity, learners use sweepnets to search a grassy area such as a large lawn or field, collecting small animals to find as many different kinds of animals as possible.

In this activity, learners build one or more edible coral polyps and place them together to form a colony.

In this activity (page 5 of the PDF), learners will create a food web and explore food sources for different organisms. They will identify relationships between organisms in an ecosystem.

In this activity, learners discover which plants and animals have symbiotic relationships and how this impacts each organism.

In this outdoor activity/field trip, learners explore an aquatic site such as a pond, lake, stream, river or seashore to find and investigate plants and animals that live in water.

In this outdoor activity that can be combined with a hike, learners try to match a "mystery community" by shaking animals out of different trees and shrubs.

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 activity, learners explore the web of connections among living and non-living things.

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

In this activity, learners investigate the food, water, and space needs of common livestock animals.

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