I found this beetle trying to burrow underneath a dung pile I wrote about recently. It’s in the superfamily Scarabaeoidea, and based on morphology and behavior I suspect it’s in the family Geotrupidae (earth-boring dung beetles). The apparently 11-segmented antennae (unique to this family), 5-5-5 tarsal formula, prominent mandibles, and its affinities for digging and poop are my main evidence.
It also has a shiny blue metallic underside:
It can be very difficult to identify beetles to any great specificity. While some are quite unique and easily recognizable (like the Japanese beetles), the vast majority are very challenging to distinguish. There are over 400,000 known species of beetles, comprising about 40% of all known insects. The beetle order (Coleoptera) contains more known species than all other animals. Since the beetle order is one of only about 34 insect orders, you can see that they’re disproportionately represented.