Started life as a volunteer for the St Michael Preserve today.  Couple of hours of fresh air and company.  Dug holes for some 20 tree houses on posts.  Designed for bluebirds, we planted them in pairs.  Tree swallows are likely to take the first one, and then chase off other tree swallows from taking the second one but allowing bluebirds to stay.  Very cunning.  Using a mechanical auger.  Took four of us to lug the heavy, awkward thing around and use it.  We were only putting in pieces of 4 x 2 to a depth of about 2 feet.  I am sure that it would have been easier using the sort of manual augers that we had on the ranch.  And far better environmentally.