Butterfly madness: One man's mania for lepidoptera takes him on an endless quest

... When he isn't scouting butterflies and recording them on a spiral notepad, O'Brien is updating his field journal, a remarkable collage of drawings, photographs and text. On sighting a cloudless sulphur at Mission Santa Barbara, he writes, "My heart leapt to my mouth as a half-dollar of electric yellow meandered by. Watched it like a fixed Pointer dog." When he stumbles upon several large clusters of spring azures at Lake Berryessa, he gushes, "I wanted to set up my tent and study them for the rest of my life."

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