<p>Goats graze on a patch of weeds on San Francisco International Airport land on June 19 in San Francisco. San Francisco airport is using 400 goats to clear from an area of the airport prone to fire.</p>
July 6, 2013
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July 6, 2013 9 p.m.
In San Francisco, only goats can prevent airport fires
Last month, officials at San Francisco International Airport hired a herd of part-time employees to toil on the west side of the property and engage in an unusual - but environmentally friendly - form of fire prevention.