This is approximately 20 minutes of feeding compressed into a minute and a half. When I returned two days later, they had fledged, so it's understandable how many insects were necessary at this point in their development (I'm only guessing there were two young).
The sap in the foreground and dripping in the background is caused by the woodpecker drilling small sap wells above and below the cavity to protect the eggs and then young from rat snake predation. They perform maintenance drilling every morning to keep the sap flowing, and is the reason they only nest in live trees.
This was shot with the GX1 + 20/1.7 on the Kowa 11-WZ eyepiece and 884 scope. The first segment was shot with the eyepiece at 25x, and the rest was shot at 60x. I was very impressed at how sharp it was at that magnification.