Tarsiers originate from the Philippines and nearby islands and are mostly active at night. Each eye is larger than the animal's brain or its stomach. Surprisingly, they are named for their extremely long feet and not for their enormous and fascinating eyes, which take up about half of the relatively tiny face. 2 Human eyes would have to be the size of apples to match tarsier eye proportions. The owl’s eyes are big enough, around 5% of their total body weight.Tarsiers, some of the world's smallest primates, have the largest eyes relative to body size among mammals ( Figure). Their enormous eyes help them see even after the sun sets. A silvery layer known as argentea also covers the eyes. Their cylindrical eyes face upward with outgrowth on the sides. In fact, the large eyes of this mammal in combination with their upright ears help them comfortably forage and navigate at night. They have big black eyes encircled with white furry rings. This gives them binocular vision helping to catch prey with ease. They have big front-facing eyes with horizontal keyhole-shaped pupils. At birth they have their eyes closed, and also come without any fur. The big eyes of the Japanese dwarf flying squirrel not just make them look appealing but also enhance their vision. This mechanism is called startle coloration. When disturbed or agonized, it takes no time to flash its red eyes that startle the enemies right away, giving the frog enough opportunity to escape. The big red bulging eyes make these frogs look unique and help them defend themselves from potential predators. The tapetum lucidum, or tissues in their eyes, increases their night vision. Their round eyes, set against their fluffy face, matched with large, upright ears, take their cuteness to another level. Their bulging eyes also allow them to rotate their head to a full 250°. GalagosĪlso called nagapies or bush babies, these small nocturnal animals have clearer night vision because of their relatively big eyes. Their big eyes provide a good night vision, also helping them see in low light while searching for their prey. They even have big, triangular sensitive ears that aids these mammals to detect prey with ease, and long fingers. The long-fingered lemur aye-aye has big yellowish-orange eyes that help them see clearly in the dark. This gives them the scope to view two objects at the same time. These chameleons can move each of their eyes separately, independent of the other. Their eyes have a scaly, cone-shaped lid with a small and round opening at the center to accommodate the pupil. The ostrich’s eyes are even five times bigger than humans or any land-dwelling animal. Their eyes are the largest among all birds, 5 cm in diameter when measured from front to back similar to a pool ball’s size. Their big eyes in front of their head give them the visual acuity needed for capturing prey even when in flight. According to scientists, the blue color helps capture more light during the colder months, contributing to better vision when it is dark. The tissues in their eyes change from golden in summer to bluish during winter. Studies show that reindeers can see lights with short wavelengths of as much as 320 nm, which is way below the human capacity of 400 nm. Of the several uses, its massive eyes help it in detecting prey. The eyes are around 27 cm wide, as big as a soccer ball. They have the largest eyes measured in any species of the animal kingdom. Their eyes are large and brown, reflecting yellowish-white or greenish-white light in the moonlight. A layer of tissues (tapetum lucidum) in their eyes improves their vision in low light. They have forward-facing eyes, which give them a three-dimensional vision. Their color vision in low light appears 350 times more sensitive than humans. When they have to clear their corneas of dust and dirt, they end up licking them since these reptiles cannot blink. Instead, they have thin and transparent membranes covering each eye’s surface. Their eyes look increasingly large since most geckos lack eyelids to cover them partially. Another striking feature is their long grayish tail, half the length of their head and body. Their sensitivity to light is six times greater than humans because of the tapetum lucidum or tissues present within. Their large eyes give them the clear vision needed to forage at night. The margay is nocturnal, preferring to hunt when it is dark. The nocturnal Philippine tarsier is one of the most significant tarsiers. They have an immovable socket and the largest eye-to-body weight ratio among all mammals. These tiny tree animals stand out because of their big eyes that remain fixed in their skull, contributing to their sharp night vision.
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