It's hard to believe that what you're looking at was a busy military airfield for about a half century…between the 1930s and the 80s… with fast jets and military bombers coming and going every day in their mission to protect the west coast. Now it’s a brand new wetland… helping to restore a bit of the natural world lost in the decades after gold was discovered in California… and tens of million of people rushed here to live and work. Over the years, we diked, drained and filled about 90% of the wetlands that once ringed San Francisco Bay to make room for agriculture, housing and all kinds of urban developments…. Including airfields like Hamilton and San Francisco international airport. Unfortunately, we lost important environments that serve nature and us….and so in recent decades we've been working hard to restore some of our historic wetlands just like those in front of you. These new wetlands will improve water quality in the Bay for all of us…provide safe homes for many kinds of animals and important resting and feeding spots for hundreds of thousands of birds every winter that stop by here on their long north-south migrations to and from their breeding grounds in places like Canada and Alaska. As you walk…. keep your eyes and ears open for busy birds… and at our next stop we'll tell you a little about how these wetlands will let fish flourish, too.