Termitarium

When an opening is made in a termitarium, soldiers crowd into the breach, and either stop the invaders or fill the breach with their termite dead.

The females are winged, but shed all but the stumps of the anterior veins after mating, before entering the termitarium.

Likewise, given time, the initially rather random clay-gathering activity of termites results in a colossal termitarium, thanks to simple innate inclinations such as the preference to deposit one's ball of clay on larger balls of clay.