Pure Green Augochlora

I originally spotted these beautiful bees cobbling nests in a rotting stump during October. I went back to the location a couple weeks later to check on them, and found that their stump had been completely dug up and pulverized. There was bear sign nearby, and so I'm guessing that a bear dug up the stump to feast on the treats hidden in there as there were lots of ants, bees, and larvae in the rotting stump. I did see a couple sweat bees still in their cells though, while a couple others aimlessly roamed the remains. I gathered the remaining chunks of stump and piled them back on top of the bees' galleries in an attempt to give them some protection during the cold winter.