I found this hawk(?) sitting on a fence near a small duck pond with a fountain near my workplace in Fort Smith, Arkansas, USA. There are some wooded hills (deciduous) nearby. It let me get within 3 meters or so before flying up to a tree across the pond. Based on measurements made of the fence it was sitting on, I'm guessing a height of 50 cm (20 inches) head to tail, I assume it'd have a wingspan of 60-70 cm perhaps (24-28 inches).
My best guess it either the Red-shouldered Hawk or Red-tailed Hawk. Unfortunately, I couldn't get a good picture of its back/tail. Any idea what species this is? I came across the bird during winter.