American Kestrel (Falco sparverius), sometimes colloquially known as the Sparrow Hawk, is a small falcon, and the only kestrel found in the Americas. It is the most common falcon in North America, and is found in a wide variety of habitats.
This is easily my favourite snake reference for the change in colour below/above and also showing the way the body curves. Also the indentation at the spine shows well here. What a beautiful white lipped python!