Tarsiers are small primates known for their distinctive physical features, particularly their large eyes. There are several species of tarsiers, but they are generally small in size. On average, tarsiers range in length from about 9 to 16 centimeters (3.5 to 6.3 inches), not including their long tail, which can add an additional 20 to 25 centimeters (7.9 to 9.8 inches) to their total length. They typically weigh between 80 and 160 grams (2.8 to 5.6 ounces).
Despite their small size, tarsiers have disproportionately large eyes, which are each roughly the same size as their brains. These large eyes enable them to have excellent night vision, as they are primarily nocturnal creatures. Tarsiers are found in various Southeast Asian countries, including the Philippines, Borneo, and Sumatra.