Before the 1940's, Western Bluebirds were a common sight in places like Edgewood .
After WWII, large-scale building development seriously impacted the ability of these avians to reproduce. Back in the 1960's and 1970's, it was rare to spot a bluebird around here.
In the 1970's people across the western United States, began efforts to bring bluebirds back. Edgewood is one of a number of places where nesting boxes help this effort. There are currently twenty three nesting boxes for Western Bluebirds in the area of Edgewood Preserve. Bluebirds nests are monitored by Friends of Edgewood volunteers in conjunction with the Sequoia Audobon Society. In 2013, 77 baby bluebirds were born in nests their parents built in park bluebird boxes.
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Wikipedia: Western Bluebird - http://en.wikipedia.org/wiki/Western_Bluebird