Burying bones

I've heard about dogs burying their bones, but have never actually seen one do it in real life.  That is, until I watched Zing do it two times in the backyard.  I was impressed by his digging skills, how gently he laid his rawhide down in the hole, and how he used his nose and paw to cover it up.  When I asked him to get the bone, he dug a little with his paws, then flipped it over with his nose, and picked it up.  Pranced off like he was allllll thatttttt..... no chips required.  ;-)