Classified for credit

Mass Audubon wildlife sanctuary with guided trails — covers bird identification, wetland ecology, and native plant communities.

Mass Audubon sanctuary with guided trails — bird identification, wetland ecology, and wildlife habitat conservation.

Mass Audubon wildlife sanctuary with self-guided trails — field study of woodland bird species, wetland ecology, and conservation biology.

Mass Audubon coastal sanctuary on Gloucester Harbor — covers shorebird ecology, marine habitat, and migratory bird identification along the Essex County coast.

Mass Audubon sanctuary on Martha's Vineyard with salt marsh and upland trails — supports bird biology, coastal ecology, and conservation science programs.

Mass Audubon sanctuary with trails through varied Central Massachusetts habitat — covers native bird identification, plant ecology, and wildlife observation.

Mass Audubon coastal wildlife sanctuary with trails and bird-observation areas covering migratory bird ecology and wetland habitat study.

Mass Audubon sanctuary with trails and wildlife education programs — covers local bird biology, habitat ecology, and conservation science.

Mass Audubon sanctuary with forest and rocky ledge habitats — covers bird identification, forest ecology, and glacial geology of western Massachusetts.

Mass Audubon sanctuary on the Ipswich River — covers freshwater wetland ecology, migratory bird identification, and conservation biology.

Mass Audubon sanctuary with trails and wildlife observation around Lake Wampanoag — supports ornithology, wetland ecology, and field biology.

Audubon-managed woodland sanctuary with self-guided trails covering forest ecology, native bird identification, and wildlife habitat conservation.

Mass Audubon sanctuary with guided and self-guided trails covering New England forest ecology, bird identification, and wildlife conservation.

Mass Audubon sanctuary in coastal Nahant — shorebird and migratory bird ecology, coastal habitat biology, and field observation skills.

Mass Audubon wildlife sanctuary with marked trails and brook habitat — field study in ecology, bird identification, and wetland biology.

Mass Audubon sanctuary on the North River estuary with guided and self-guided trails covering salt marsh ecology, shorebirds, and riparian biology.

Mass Audubon wildlife sanctuary with trails and wetland habitat — supports bird identification, forest ecology, and conservation biology.

Mass Audubon sanctuary with meadow and wetland habitats supporting bird identification, plant ecology, and field observation skills.

Mass Audubon wildlife sanctuary with trails and beaver wetlands — covers bird biology, wetland ecology, and field identification.

Mass Audubon wildlife sanctuary with trails — covers bird ecology, forest habitats, and wildlife observation in a managed conservation area.

Mass Audubon sanctuary with maintained trails through central Massachusetts woodland and meadow — bird identification, forest succession, and wildlife habitat ecology.

Mass Audubon salt marsh sanctuary in Rowley — covers estuarine ecology, tidal biology, and migratory shorebird identification along the Parker River corridor.

Mass Audubon heathland sanctuary on Nantucket protecting rare shrubland habitat — covers coastal ecology, rare plant communities, and bird conservation.

Mass Audubon sanctuary with guided trails, beaver wetlands, and bird programming — supports ornithology and wetland ecology.