A close relative to the first butterfly species in the U.S. to disappear because of human development, is making a comeback right here in the Bay Area. 

There are currently dozens of Silvery Blue butterflies fluttering across the sand dunes in San Francisco's Presidio area, thanks to researchers from the California Academy of Sciences.  

More than 40 years ago, it was pretty common to see the shimmery and iridescent Xerces blue butterfly in San Francisco, but since the species went extinct, scientists have been looking into a way to bring them back. 

For more details, KCBS Radio news anchors Bret Burkhart and Patti Reising spoke with Durrell Kapan, Senior Research Fellow and the lead academy researcher on the project.