The Family Tarsiidae consists of small, nocturnal primates known as tarsiers, found primarily in Southeast Asia, including the Philippines, Borneo, and Sumatra. Tarsiers are distinguished by their enormous eyes adapted for night vision, elongated tarsal bones for leaping between trees, and highly flexible necks that can rotate nearly 180 degrees. They are insectivorous and carnivorous, feeding on insects, small vertebrates, and occasionally birds. Tarsiers are mostly solitary or live in small family groups, and their arboreal lifestyle makes them highly adapted to dense forest habitats. Their unique combination of traits makes them an important subject in primate evolutionary studies.