Sorry about the error with the Heron picture... (The red X might have been paying him back for all of my goldfish he dined on last summer!) You should be able to view it now.
A woodpecker is drilling in a
tree doesn't necessarily mean the limb is dead! I'm no expert on Woody, but I do know that woodpeckers will drill holes into a live
tree intentionally to cause it to bleed sap which in turn attracts bugs which get stuck in the muck. The woodpecker will return regularly to harvest the bugs he's trapped!