Earth-boring dung beetle

The Earth-Boring Dung Beetle is a bug introduced in that can be found all day from July to September (in the northern hemisphere). It sells for 300 Bells.

In
Blathers has this to say about the earth-boring dung beetle:

When donated, it is found near the entrance of the exhibit, crawling around on the ground between the two trees holding the Wasp and Bagworm.

Real-world information
The earth-boring dung beetles (Geotrupidae) are medium-sized beetles with 600 known species worldwide. The majority of the species feeds on dung or decaying plant matter. A few species are herbivorous. Many of the species exhibit brood care behavior by digging tunnels, which are used to store dung balls as food for their developing larvae. When earth-boring dung beetles do carry or roll the dung away, they do so primarily to feed their young. Most prefer to feed on herbivore droppings, which are largely undigested plant matter, rather than carnivore waste, which holds very little nutritional value for insects.