Don Edwards San Franciso Bay NWR, California

San Francisco Bay NWR, Newark, California: Hikers and bikers can get close-up looks at a variety of birds and other wildlife from the 30+ miles of trails at San Francisco Bay Refuge. This refuge has more land below water than above it and is home to species as diverse as harbor seals and salt-marsh harvest mice, peregrine falcons and pelicans. During spring and fall migrations, shorebirds may number up to one million, waterfowl around 700,000, and wading birds about 30,000. San Francisco Bay is the first urban refuge in the system and has the largest public use program in the country.