Nice!! I hate digging but I do like when it's for a reason. My previous rommate's GSD used to dig in the same areas constantly and my roommate decided to investigate once and it turned out that he was digging only where there were leaking pipes! No wonder the water bill was unusually high!! After the pipes were fixed, no more digging ever! Good boy Brutus!
Hope you guys got rid fo them too... any of those bugs are nasty. Not sure about the fire ants, but it'd be interesting to check them out like MichaelE said.