Red Foxes are the largest of all the true foxes. Naturally agile, they can clear obstacles of over 6 foot (2 meters). This would be like an Olympic High Jumper jumping over an 18-wheeler truck with ease. This image is from Animal Fight Club.
A coyote stands and looks intently at the camera. Hardwired to survived and masters of stealth, coyotes have colonized urban habitats all around North America. Abundant food and protection from predators have allowed the coyote to thrive in the human world. This image is from Invaders.