South American gray fox (Lycalopex griseus) kits enjoying play with an edge. Per Wikipedia, this species is also known as the Patagonian fox, the chilla or the gray zorro. This is a species of Lycalopex, the "false" foxes. Whatever you call them, these little guys were a whirlwind of activity and extremely cute.
Laguna Amarga, Torres del Paine National Park, Patagonia Chile.