This Fourth of July, we’re honoring the creatures that make the United States rich—in biodiversity, that is.

To date, scientists have identified more than 32,000 distinct animal species living in the country, from thousands of species of beetles to just one marsupial (it’s the Virginia opossum).

According to NatureServe, an organization that keeps tabs on North American flora and fauna, more than 7,000 of those species are endemic, meaning they’re native to the U.S. and nowhere else—and researchers are certain that’s an underestimate. (Learn more about July 4th and its history.)