Counting species in California's Muir Woods

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Counting species in California's Muir Woods

by CBSTV Videos 5:30 mins

Counting species in California's Muir Woods

by CBSTV Videos 5:30 mins

In a bold effort called a "bioblitz," teams of scientists, students and volunteers took part in a 24-hour inventory of every species living in the 116-square-mile Muir Woods National Monument just north of San Francisco. Carter Evans reports.

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