Do you know the smallest monkey spends its entire life on trees? Yes! It's true. Tarsier, an unusual mammal, just keeps clinging to the trunk of the trees, even while sleeping and giving birth to the young ones. Isn't it amazing? This nocturnal animal has large eyes, a long tail and ears with almost no hair. It is a carnivores animal and can move its ears to determine the location of the prey. The most unusual thing about this animal is its flexible neck that it can turn up to 180 degrees. Tarsier is about the size of squirrel but it has long tail. Since they can't walk, they hop when they on ground and mark their trees with their urine. Interesting Tarsier fact is that Tarsier is neither a monkey nor a primate. It is something in between. Philippines' tarsiers are smallest of all tarsiers and their eyes are as big as their brain.