Ellicott Slough National Wildlife Refuge is small but diverse with foothills, valleys, and coastal scenery. The refuge is composed of three units: Ellicott Unit, Calabasas Unit, and the Harkins Slough Unit. Each unit plays a significant role for either threatened and endangered species, migratory birds, or wetland protection.
In addition to federally-listed species, Ellicott Slough National Wildlife Refuge provides homes for a variety of wildlife, including amphibians and reptiles, mammals, birds, fish and invertebrates.
The three refuge units offer distinct habitat types for a different types of wildlife.
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Ellicott Slough NWR is managed as part of the San Francisco Bay National Wildlife Refuge Complex.