0.5" (13mm). Overall reddish-brown with spines on thorax; often seen
carrying leaves and other plant material.
NATURAL HISTORY: Feed on fungus that they raise underground. Workers snip
off leaves and other plant parts and carry them back to the nest, sometimes
in long lines. The leaves and plant parts are "chewed" and fed
to the fungus they grow in large chambers underground. New queens will
take a "starter" batch of fungus with them to found their new
nest colony. This is a great example of mutualism;
in this case the ants depend on the fungus for food and the fungus depends
on the ants for a place to live and food. See Dale Ward's Ant's
of Arizona website for more information and photos.
Click on thumbnails below for more images: