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Learning about nature won't protect it, but studies have shown that being outdoors can keep you healthy - not to mention sane.

In 1948, a battery of large-caliber machine guns was installed at Milagra Ridge to help protect the entrance to the SF Bay, but the plans were soon abandoned and the guns were removed only a year later.

Busting Our Butt(erfly)

The Bite:

Think you have to hike countless miles uphill both ways in order to see endangered species? Nope: Get an eyeful of some stunning, rare butterflies in action with just a short drive to Pacifica. Nature in the City's lepidoptera (er, moth and butterfly) expert and two wildlife habitat restoration pros will take you on a 1.5-mi hike and give you the lowdown on how this former Nike missile site was transformed into a hotspot for the mission blue butterfly. The guides will provide snacks for the trail - bring your own water bottle - and the wildflowerful (you read it here first) Milagra Ridge will provide the scenery. So worth the effort.

Wanna Try?

Golden Gate National Recreation Area's mission blue butterfly trip; Apr. 19, 1 p.m.-2:30 p.m. (415-561-3067). Free, RSVP required; call number above.

View this tip online at http://www.idealbite.com/tiplibrary/sanfrancisco/busting_our_butterfly

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