Formica aerata
Hallelujah Junction, Lassen Co., California, USA

photograph © Alex Wild 2004

Formica aerata, the gray field ant, is a common species in riparian habitats in California. 
Here a worker ant tends aphids on a willow tree.

This image is copyrighted by the photographer and cannot be used without permission. To obtain permission to use this image, please email Alex Wild. (alwild (at)  Most of the photographs on are reduced from their original size and compressed for more efficient web transmission.  In some cases, higher quality versions are available.

This image was captured with a Canon EOS D60, with a Canon 65/2.8 MPE 1-5x Macro lens.