Ursus, commonly referred to as "ursi," is a genus of large mammals known as bears. These animals are characterized by their thick fur, strong limbs, and a keen sense of smell. Ursus species, such as the American black bear and grizzly bear, are found in various habitats, including forests, mountains, and tundras. Bears are omnivorous, meaning they eat both plants and animals. Their diet can include fruits, nuts, insects, and fish. Ursus species are known for their hibernation behavior, where they enter a state of dormancy during winter months to conserve energy when food is scarce.