Photo: Diane Edwardson, July 28, 2011. California Harvester Ants have an extensive series of colonies stretching from the historic viaduct footings to the oak tree on Lot C of the Red Car Property. (Click on photo to enlarge.)
California Harvester Ants are NOT Fire Ants. They are a native species that will defend their colony if threatened. They are NOT an invasive, dangerous species like Red Imported Fire Ants.
In CEQA-speak, Harvester Ants are an "indicator species." Their presence in the ecosystem is an indicator of a healthy environment with ample and diverse food sources to support their continued survival.