The Big River tract in California's Mendocino County is a sprawling expanse of towering redwoods and Douglas firs, woods that for years have provided an ideal habitat for rare spotted owls and endangered coho salmon and steelhead trout. Now, it's all up for sale.

Big River, neighboring Salmon Creek and dozens of other forests across the nation have come on the market in recent years as timber companies shed holdings that are worth more as real estate than as a source of lumber. The trend has spurred a land rush that has conservation groups scrambling to raise money to buy environmentally sensitive tracts in competition with private investors seeking to snap up the land for development.

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