Skip to main content Currently Reading With a little help from ecologists and a net, a butterfly makes its way back to S.F.'s Presidio FacebookTwitterEmail Presidio Trust ecologist Jonathan Young (left) looks inside a container after capturing a California ringlet butterfly, working with David Harelson and lepidopterist Liam O’Brien in Marin County.Gabrielle Lurie/The Chronicle A group of ecologists, volunteers and a lepidopterist trudged up a Marin hillside in the warm sun last week, nets and coolers in hand. They scoured the grassland for a small butterfly with silver-gray wings and the occasional pop of copper-orange, a color scheme that helps it blend into the yellowing grasses and spring poppies.