Wild Eyes Most eyes work in the same way. Yet they can look remarkably different. Some animals have pupils with an odd shape. Te cuttlefish’s pupils are shaped like the letter “W.” Other animals have special ways to use their
eyes. A four-eyed fish only has two eyes. But its eyes are raised on the top of the head and divided in two parts. Tat means it can see below and above the water surface at the same time. Many animals have two eyes. Others have
A cuttlefish has some of the most unusual pupils. They are shaped like the letter “W.”
dozens. A scallop has about 100 eyes around the edge of its shell to watch out for danger. Te position of an animal’s eyes is also
important. Tink of a falcon. Its eyes are on the front of its head. Tey face forward. Tat lets both eyes see much of the same view. Tis is called binocular vision. Te falcon
gets information about the same view two times, once from each eye. Tis helps the falcon figure out distances. How far will it have to dive to catch a mouse?
Even when a red-eyed tree frog sleeps, it sees what’s going on. It has see-through eyelids!
Seeing Danger Other animals, like mice, have eyes on the sides of their heads. Each eye sees a different view of the same thing. Tis is called monocular vision. Tese animals can see in front, above,
below, beside, and even behind their bodies. Seeing in more than one direction helps them try to keep one step ahead of predators. A chameleon’s eyes are on the side of its
head, but its eyes can move independently from one another. One eye can look forward for prey. Te other eye can look behind for predators. A fiddler crab’s eyes stick up high above
its body. Its eyes are on stalks that can swivel! Tis lets the crab see in many different directions without moving its body. Te box jellyfish relies on all 24 of its eyes.
A chameleon has cone-shaped eyelids. Just the pupil peeks out of a little hole in the center.
22 NATIONAL GEOGRAPHIC EXPLORER
Tey dangle from its body! Having so many eyes may help the box jellyfish skim the ocean floor without bumping into rocks.
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