Carrion Birds describes the enormity of the destruction Jesus foresaw. Israel would be rendered carrion to be picked over by the Roman legions.
Modern readers tend to overlook the significance of the date of Quirinius’ census in the Infancy Narrative of Luke’s Gospel. Preachers and interpreters frequently point to Luke’s mention of the census as proof that God maneuvered even the pagan Roman authorities to bring about Jesus’ birth in Bethlehem. Few note the significance of the date within the history of the Jewish people living in the land of Israel. It’s my feeling that the events surrounding the census of Quirinius drew Luke to mention it within his narrative and connect Jesus’ birth to this event.