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Andy Goldsworthy plots the curves of new Presidio creation

A newly built trail and boardwalk on the southern edge of the Presidio is as much a window into San Francisco's maritime history as it is a path through restored sand dunes and coastal habitat.

May 2011 marks the 10th anniversary of the $34 million restoration of Crissy Field, a 1.3-mile stretch of shoreline between the new Crissy Field Center on the east and the Warming Hut on the west - one of the great vistas anywhere.

The flower beds that once served as colorful buffers for the notorious former prison site known as the Rock have been restored thanks to the efforts of the Alcatraz Historic Gardens Project.

Spotted owls are one of the most iconic threatened species in the West. But despite two decades of work to bring them back, their numbers are still declining. That may be due in part to a new threat - not from humans, but from other owls.

Spotted owls are one of the most iconic threatened species in the West. But their numbers are still declining that may be due in part to a new threat, not from humans, but from other owls.

Frank Dean, General Superintendent of the Golden Gate National Recreation Area, is the head man at the biggest urban park in the country.

Looking for ways to volunteer in San Francisco to help keep the city green?

Muir Woods National Monument Rediscovers its Natural Soundscape.

A Miracle of Survival! A Franciscan Manzanita--a species thought to have been extinct in the wild for almost 70 years--is rediscovered at a construction site near the Golden Gate Bridge.

Eat too much this holiday season? Burn some of it off with this Crissy Field workout.

Marin creek's $13 million restoration should give boost to coho