for the more than in over 30 San Francisco parks designated Significant Natural Resource Areas. The site specific plan for Twin Peaks covers the issue of habitat conservation for the Mission blue. The plan recommends that priority be given to "maintaining the habitat necessary for Mission blue butterflies, especially the host plant (silver bush lupine)." The silver bush lupine is common in and around Twin Peaks. In addition the Management Plan recommended that the Mission blue population at Twin Peaks]The Twin Peaks be monitored and the host plant populations should be augmented whenever possible. The Mission blue is the only federally endangered animal at Twin Peaks; however, the Bay checkerspot butterfly is a federally threatened species. Aside from these, the park at Twin peaks is home to about 20 other species that are threatened or endangered at a local level. Most threatened species at Twin Peaks are of local concern only. Fire rehabilitation Popular thought is that the host plants, lupines, require periodic disturbances in order to successfully reproduce. Many possible natural disturbances are actively worked against by humans, such as fire and landslides because areas are designed with a dual use purpose in mind, often for recreational use. Solstice fire In June 2004, the Solstice Fire burned near Sausalito, California. The fire started when an errant "international visitor" had a fire mishap while camping. This fire threatened historical buildings which a public-private partnership planned to turn into a conference center. The building was spared but a stand of non-native Monterey pines was not so lucky. The Monterey pine, a pesky invasive species that has become "naturalized," is continually encroaching on the coastal grasslands that the Mission blue butterfly prefers and requires. Over 250 trees were removed from the area after the fire, burnt remnants of what they once were. The charred trees were chipped and the chips utilized in an electric generation facility as well as on site to control cape ivy, another invasive species. The area that was cut was seeded with native plants. Among them, purple needle grass, in fall 2004 and again in fall 2005 about one pound of purple needle grass seed was sowed directly on the burn site. 400 summer lupine seedlings were also planted, most were grown in nearby nurseries while some were collected in the Marin Headlands. Still, both plants are forced to compete with non-native Italian thistle and French broom. Lateral