It's interesting to note the mites that are swarming the beetles (and the snake carcass), as well as the noises the beetles are making to one another.
Here's a closer look at a burying beetle, photographed in June when I was doing some blacklighting in the backyard. It, too, is covered in mites:
Burying beetles, like carrion beetles, are in the Silphidae family. They're extremely important insect scavengers and play a large role in carcass decomposition.