Messor Ant Nest on Jasper Ridge
Nest of one of two grassland "Harvester Ants" at Jasper Ridge, of different scales. Main image: Messor andrei nest, approx 1.5 - 2 meters across, surrounded by discarded chaff. [p 1]
I call this Nest A: Road F, near Escobar Gate, east of Trail 15.