April 28, 2015
: the action or process of excavating
: a cavity formed by cutting, digging, or scooping
This is a hole made by a pileated woodpecker they are unique rectangular holes in the wood. T
he nest holes these birds make offer crucial shelter to many species including swifts, owls, ducks, bats, and pine martens.
A Pileated Woodpecker pair stays together on its territory all year round. It will defend the territory in all seasons, but will tolerate new arrivals during the winter.
source Cornell Lab or Ornithology.