Crabs are crustaceans, we can often see crabs, it is easy to observe them.Although crabs are not very advanced animals, they still have some basic body structures.For example, eyes, crabs have eyes, and more obvious, if you observe them, you can easily observe.The eyes of crabs, like the eyes of other animals, are used to see things, their eyes play a very significant role in their various life activities can play an important role.
As mentioned above, crabs have eyes.Judging from the number, crabs have two eyes.Although the number of eyes in crabs is two, it is different from the two eyes of humans and many animals, because the eyes of crabs are compound eyes, which are composed of hundreds of single eyes.
The structure of these two compound eyes is quite special, the shape is like two small balls, but the back seems to be with a handle.Moreover, the handle can rotate freely.In this way, crabs want to observe which direction will move the direction of the handle at will, turn their eyes to a specific position, you can see the direction and position they want to see, it can be said that the direction of crab observation is omni-directional, no dead angle.In fact, in real life, crabs often bury their bodies in sand, and then only expose their eyes, so that they can observe the movement around them at any time.
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