I don’t know what species this hard worker belongs to, but I do know from past experience that it can deliver an excruciating sting when it bites. I kept well out of its way. In addition to the queen, fire ant colonies consist of major workers (up to 1/3 inch in length) and minor workers (up to about 1/10 inch). This one was a major worker. I watched the ant working hard to drag its prey across the rough terrain. Suddenly it dropped the load, climbed up on it and surveyed the area,
then calmly walked away and left it.
I'm still wondering why, after all that hard work, it abandoned the project.