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The Fairfield Osborn Preserve is a 411 acre (1.6 km²) nature reserve situated on the northwest flank of Sonoma Mountain in Sonoma County, California. There are eight plant communities within the property, oak woodland being the dominant type. Other communities include chaparral, Douglas fir woodland, native Bunch grass, freshwater marsh, vernal pool, pond and riparian woodland. The flora is extremely diverse including many native trees, shrubs, wildflowers, grasses, lichens and mosses. A diverse fauna inhabits this area including black-tailed deer, coyote, bobcat and an occasional mountain lion; moreover, there are abundant avifauna (including some neotropical migrants), amphibians, reptiles and insects.
Copeland Creek and its tributaries drain the Preserve as they wend their way down steep ravines toward eventual discharge to the Laguna de Santa Rosa. The property was originally a Spanish Land Grant holding, devolving to private ownership and eventually gifted to The Nature Conservancy; the preserve is now owned and managed by Sonoma State University as a research and education site. An understated natural trail system weaves through the property to provide access to creek canyons, ridges and marshy areas.
