Arctotherium angustidens is an extinct species of giant bear that lived during the Pleistocene epoch, primarily in South America. It is known for its impressive size, with some estimates suggesting it could weigh over 3,500 pounds, making it one of the largest bear species ever discovered. Fossils have been found in various locations, indicating it roamed a wide range of habitats. This species is believed to have primarily fed on large herbivores and scavenged for food. Its adaptations suggest it was well-suited for a diverse diet, which may have included fruits and plants. Arctotherium angustidens is an important part of the study of prehistoric megafauna and their ecosystems.