natural salinity regime of the marsh, making it more saline. In an effort to maintain the wetlands, the marsh landowners sought legislation to preserve the area from residential or commercial development. In addition, they pursued relief from the impacts of the water projects on the salinity regime of the marsh. As a result, the parties entered into agreements to offset the impacts of the water projects on the managed wetlands. Today, Suisun Marsh supports a diversity of fish, wildlife and plants, including a large population of river otters, a number of native fish species, and birds ranging from marsh wrens to American white pelicans. Rush Ranch has only been recently acquired and is managed for both historic and biological values. However, its habitats are being enhanced and many tidal marsh plants and animals can be seen there. Rush Ranch is a 2070-acre (8.4 km2) remnant tidal marsh preserve within Suisun Marsh that was acquired for wildlife habitat and public access to the marsh by the Solano County Farmlands and Open Space Foundation in 1988. The non-profit organization, dedicated to protect and preserve farmland, ranchland and open space in Solano County, has since been renamed Solano Land Trust. A component of the Solano Land Trust located at Rush Ranch is the Rush Ranch Educational Council, more commonly known as RREC. RREC is an all volunteer, non-profit organization that offers an educational program to 3rd and 4th grade students who visit the ranch on field trips. The program is offered at no charge, made possible by a grant from the Nature Conservancy in partnership with the Solano Land Trust. The program—designed to meet California K-12 education standards for history-social studies—teaches children about the original inhabitants of the ranch, the Patwin Indians, on a recreated Patwin village located on the ranch. The interactive program is divided into six stations, each focused on a facet of Patwin culture and daily life. At these stations, RREC docents use replicated tools and materials to demonstrate the ways in which the Patwins were able to thrive and ensure generational survival using seasonally available resources and by employing sustainable harvesting and natural resource conservation. Another public part of the marsh is Grizzly Island Wildlife Area which is managed primarily for waterfowl, although over 230 species of birds have been seen here as well as many mammals, amphibians, reptiles, and fish. Grizzly Island has an unusually dense population of