| Here's an interesting fact: the seahorse, that strange | | | | position, but, as they grow older, the eyes slowly |
| little fish with a head like a tiny horse, apparently can | | | | migrate until they are both on one side. The fish then |
| see both forward and backward at the same time. | | | | swims with this side as the top of its body. Flat worms |
| There is also the whirligig beetle, which we see on the | | | | of at least one family have eyes all over the body. |
| surface of quiet water, this creature is equipped to | | | | These eyes apparently do not discern objects, but |
| look up and down at the same time. Its eyes are | | | | they enable the worm to respond to light. In fact, most |
| divided so that the upper part sees t h e surface of t | | | | worms have light-sensitive bodies, even though they |
| h e water and t h e lower part sees below the | | | | have no distinct eyes. In effect, the whole body is one |
| surface. There is a black layer of pigment between | | | | big eye. |
| the two parts so that light from one does not affect | | | | In order for an eye to operate, light must be reflected |
| the other. | | | | from some object back into the eye. In the sea depths, |
| There is a strange fish, Anableps, called the four-eyed | | | | where the sunlight cannot penetrate, there is no natural |
| fish, which has its eyes, divided somewhat like those of | | | | light, so deep-sea fish must provide their own light if |
| the beetle. It can search for insects on the surface, | | | | they are to see. Some carry quantities of bacteria, or |
| and. at the same time, with the lower part of its eye | | | | tiny little luminous plants, which furnish the light. Some |
| see what is beneath it in the water. Fishes that live on | | | | carry other luminous animals, such as sea anemones. |
| the bottom of the ocean, and some that live in the | | | | Some have their own headlights. There are some |
| lower levels of water above the bottom, have 110 | | | | animals that one would expect to have eyes, but |
| reason to look anywhere hut upward. Their food | | | | which do not see at all. There is the blindfish found in |
| comes down to them, and their eyes are designed to | | | | the waters of Mammoth Cave, the hagfish or slime |
| look up. Those fishes known as flat fishes are born | | | | eel, of many oceans. These blind animals find their |
| with eyes in "what we would consider a normal | | | | food and mates through other senses. |
