Xerces blue butterfly possibly spotted in SF

San Francisco CA

Description

Hi, I'm replying to the NYT article this-butterfly-was-the-first-in-north-america-that-people-made-extinct.html I think I saw this butterfly for 3 straight days around Buena Vista Park's upper hills a week or so ago. I've never seen one like that and it was quiet memorable. I could not get it to sit still for a pic like the others I've seen here. It might not be extinct in SF... Anybody know the author or someone connected to this?