Pogonomyrmex barbatus (Red Harvester Ant)

Pogonomyrmex barbatus worker blocking her nest entrance with stones. They often do this as they are entering an inactive period, perhaps to keep predators and parasites out of their nest.
Pogonomyrmex barbatus worker blocking her nest entrance with stones. They often do this as they are entering an inactive period, perhaps to keep predators and parasites out of their nest.