In one scene a man comes with a large sack and throws seeds out for the pigeons......I believe in the park.......hundreds of pigeons converge on the seeds......and then........BBBBBOOOOOOOOOMMMMMMMMM......a hawk swoops down and grabs up one of the pigeons.
I play golf at a club just north of the city. When I noticed that you never see squirrils early in the morning and late in the afternoon, I asked a woman in the Audubon society about it. She said that squirrils can't look up, because their eyes are on the side of their head. They look side to side. So the way they know the hawk is around is by the shadow. But they can only see his shadow when the sun is realitively high in the sky. As the sun gets lower, the sun moves farther and farther away, and the squirrils know it's time to call it a day.