Classified for credit

Sonoran Desert national monument with rare organ pipe cactus habitat — covers desert ecology, geology, and Sonoran biodiversity.

Large private bear ranch in Michigan's Upper Peninsula housing North American black bears — supports wildlife biology and animal behavior observation.

Wildlife park featuring large predators and exotic animals in open habitats — covers animal biology, behavior, and conservation.

National Park Service scenic riverway with ranger programs — covers Ozark ecology, watershed biology, and riparian geography.

NPS unit protecting spring-fed Ozark rivers with ranger programs — covers freshwater ecology, karst geology, and riparian biology across multiple access points.

Longest barrier island in the world with ranger programs — coastal ecology, sea turtle conservation, barrier-island geology, and Gulf Coast geography.

Washington state park featuring a dramatic basalt canyon waterfall — geology of the Channeled Scablands, hydrology, and Pacific Northwest ecology.

Florida state preserve with bison, sandhill cranes, and diverse wetland ecosystems — supports ecology, wildlife biology, and field observation skills.

NPS-managed forest park near DC with ranger programs covering Piedmont ecology, forest biology, and outdoor skills — well-developed trail and visitor infrastructure.

Natural sandstone arch monument sacred to Navajo Nation — covers geology, erosion processes, and Native American cultural geography.

Federally protected Wild & Scenic River corridor in Big Bend — riparian ecology, desert geology, and river geography in a remote backcountry setting.

AZA-accredited zoo with strong conservation programming — covers zoology, animal behavior, and global conservation biology.

African wildlife preserve with guided open-vehicle tours — covers animal behavior, African ecosystem ecology, and conservation biology.

National park protecting the Sonoran Desert's giant saguaro cactus ecosystem — covers desert ecology, plant adaptations, and Sonoran geography.

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

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

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

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

Sedona's red rock canyon park with trails through sandstone formations — geology, erosion, and high-desert ecology of Arizona's Colorado Plateau.

One of the largest waterfalls in the US by volume — geology, hydrology, Snake River canyon formation, and Idaho physical geography.

Wolf and wolf-dog sanctuary in Naples, FL offering educational tours — covers canid biology, wildlife rescue, and conservation ethics.

Outdoor nature center on Squam Lake with live native animals, naturalist-led programs, and trails covering NH ecology and wildlife biology.

Accredited zoological park specializing in crocodilians and reptiles — covers herpetology, adaptation, and conservation biology.

Illinois state park with dramatic sandstone canyons and waterfalls — covers geology, river ecology, and Illinois natural history.