Formica aserva & Formica fusca
Sagehen Creek, California, USA

photograph © Alex Wild 2003

Formica aserva, at left, is a facultative slave-raiding ant. One of its preferred hosts in California is Formica fusca, shown here at right.

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 Nikon Coolpix 995.