More than 4,000 invasive species—usually introduced species that did not evolve in a particular area—had been established in the United States alone as of 1999. The delicate balance of nature that gave rise to unique species like the Marvelous Spatuletail of Peru and the Maui Parrotbill of Hawai'i is easily unsettled by the presence of invasive plants and animals. … Continue reading Cats | Invasives