human society says previous hunt used pen-raised birds

I hadn't seen this before. In December of 2003, the Humane Society e-mailed a statement about the Vice President's hunting trip with Justice Scalia to The Pittsburgh Channel. The society pointed out it wasn't an expedition for wild birds. Instead, it's an activity in which pen-raised birds are stocked in the field and then released. Think skeet shooting using live animals. I couldn't find any news saying whether or not this latest expedition was the same sort of thing.