Studies of Arctic foxes and red foxes. It’s a lot easier to find video reference of red foxes than it is arctic foxes, probably because they’re more abundant and much likelier to occur in areas inhabited by people, so most of these sketches are of the red variety.
While there are numerous differences between the red fox and the arctic fox, they serve as a decent substitute for studying fox motion. Plus, having much less fur, it’s easier to make out the body structure on red foxes. Arctic foxes look like white puffballs in their winter coats.