Light passes through the pupil of all eyes, and focuses onto the retina by the lens. In the retina are more sensory nerve cells than anywhere else . They are light receptors called rods and cones. Rods are low light sensors and cones are bright light sensors. Most nocturnal eyes have few cones. Some have none at all. But, they have no shortage of rods. So, their night sight is good. You have fewer rods and more cones, so you have better daylight vision and see with more detail.
What is fear?
Fear is a self-protection instinct. When animals (including humans) are in a situation they believe could hurt them, certain things happen. A burst of adrenaline makes the heart race fast. An overwhelming need to get away takes over. If the animal (like humans) has hair, the hair stands up (goosebumps), making the animal look bigger, and better able to protect itself.
Fear is the instinct that helps stop us from getting hurt or killed...which is good. But, sometimes, fear stops us from doing things that are fun or different because we don't know enough about them.
But, there are only a few
animals (nocturnal, diurnal, or crepuscular) that will attack humans.
|The Night and You
Have you ever heard anyone say that they're a "morning person" or a "night person"? Some people like staying up later than other people. Does that make them nocturnal? No. It turns out there are physical differences between diurnal and nocturnal animals. But, if you have a cat (nocturnal), you know they will do things when the sun is up. And many people go out at night.
So, what's the difference between us? Why can't we (humans) get around at night as well as nocturnal animals? And why can't they do as well as we do in the day?
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