Dung beetles, Sonoran Desert

Dung beetles, Sonoran Desert an iPhone video by ConserVentures on Flickr.

We frequently see dung beetles diligently working the cow droppings around Ravenrock. Earlier this spring we watched six beetles at one fresh cow patty, madly rolling up dung into perfect spheres and then surprisingly quickly pushing it away with their hind legs, usually two beetles to a ball.

But yesterday we found these two just outside the front door to our cottage—and were just enchanted.

I need to research what species of dung beetles are here in the Sonoran Desert; it's possible these 2 are in the genus Onthophagus. 

Has anyone seen any like this before? To describe them as "adorable" seems antithetical to a dung-harvesting insect, but it's true!