Classified for credit

National scenic riverway with ranger programs covering riparian ecology, geology, and watershed biology along the St. Croix River.

Federal wildlife refuge on the Gulf coast with migratory bird habitat, salt marshes, and a historic lighthouse — covers ecology, ornithology, and conservation.

Free municipal zoo with over 400 animals — supports zoology, animal behavior, and wildlife conservation programs for K–8 learners.

Vast national forest in central Idaho covering mountain ecosystems, watershed biology, and Rocky Mountain geology across ranger districts.

Federal wildlife refuge on salt flats where visitors can dig for hourglass selenite crystals — covers mineralogy, migratory bird ecology, and Great Plains geography.

Oklahoma state park on a salt-encrusted lake bed where visitors can dig selenite crystals — covers evaporite geology, mineralogy, and Great Plains ecology.

National park and ecological preserve in the USVI combining Taino archaeological history with coral reef and estuary ecology study.

Oregon Coast scenic corridor with sea stacks, old-growth forest, and tide pool access — supports Pacific coastal geology, marine ecology, and physical geography.

Marin County redwood and riparian park with ranger programs covering old-growth ecology, salmon habitat, and coastal California natural history.

San Antonio Botanical Garden with regional and international plant collections — supports plant biology, ecology, and conservation across diverse biome exhibits.

37-acre botanic garden with themed plant collections including a children's garden — covers plant biology, horticulture, and world biomes in a hands-on outdoor setting.

Regional botanic garden with diverse plant collections — plant taxonomy, ecology, and California native plant biology.

55-acre botanical garden with over 9,000 plant species from world biomes — covers plant biology, ecology, and global biome classification.

Utah state park featuring a red-rock reservoir, sand dunes, and desert terrain — geology, arid-land ecology, and physical geography.

Seasonal migration of 500,000+ sandhill cranes along the Platte River — covers bird biology, migration ecology, and Great Plains geography.

Barrier beach and dune system within Parker River National Wildlife Refuge — coastal geomorphology, shorebird ecology, and Atlantic migration corridors.

South Texas refuge at the confluence of two flyways — bird biodiversity, subtropical ecology, and wildlife conservation studies.

City zoo with focus on animals of the Americas and conservation programs — supports zoology, biodiversity, and wildlife conservation curriculum.

Botanic garden dedicated exclusively to California native plants — covers plant adaptation, Mediterranean climate ecology, and regional conservation biology.

Accredited zoo with strong conservation programs covering vertebrate biology, California coastal wildlife, and endangered species management.

Accredited zoo run by Santa Fe College zoology students — covers animal biology, wildlife conservation, and zoo science with unusually detailed keeper interaction.

Vast national forest near Los Alamos covering diverse ecosystems — supports field study in ecology, geology, and high-desert geography.

Large NPS recreation area in the Santa Monica Mountains — covers chaparral ecology, California native species, watershed geography, and outdoor education.

Federally designated estuarine reserve on a barrier island covering salt marsh ecology, coastal geology, and marine research methods.