Gray foxes are the only canids (members of the same family as dogs, wolves, coyotes, and jackals etc) who commonly climb trees. And wow, can they climb!!
These 4- or 5-month old gray fox pups got to playing one sunny afternoon in the backyard and for about 30 minutes they raced up and down the cedars, purely for the joy of it. Nothing more to say here, really. Enjoy the video!