File:Trachymyrmex septentrionalis, Shaw Nature Reserve, Missouri, James Trager.jpg

A large nest of Trachymyrmex septentrionalis must be under this large pile of excavated material. Smaller pellets (about 1.7mm diameter) are excavated material in a pile about the size of my hand. Larger particles (3-4mm diameter) are bits of charcoal and gravel gathered by the ants and placed around the nest entrance.

Shaw Nature Reserve, Missouri.

Photo by James Trager.