Peregrine falcon swooped down to land on the fence. Walked a little, looked annoyed, walked a little more, flew away. Must be one of the ones who perch on the roof of the Sanitation garage by the river. They hunt up and down the river park, but hunting must be a little slim today, so he's come further afield. Only the third time in all my years here, writing at this window, I've seen a bird of prey.