Ground beetles are diverse insects, with over 40,000 species found worldwide, including in North America. These creatures have dark-colored bodies that can appear metallic in certain lighting conditions. 

Moreover, they are often difficult to spot during the day as they seek shelter under rocks, logs, and leaf litter. When night comes, they become more active. 

Ground beetles and their larvae feed on smaller invertebrates, like slugs, snails, and caterpillars, which helps keep pests in check.

Apart from their role as predators, ground beetles have unique defense mechanisms to protect themselves from danger3. 

Some species emit a foul odor to deter predators, while others, like the Bombardier Beetle, spray a hot, toxic chemical from their bodies for self-defense. However, these defense mechanisms do not pose any threat to humans.