People's Education Press Third Grade Science Volume 1

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"Animals Around You" Making Friends with Animals PPT Courseware 2

Cats' color vision is often ignored by people, thinking that they live in a black and white world. Indeed, cats cannot distinguish rich colors like humans and can only distinguish limited colors, such as gray and green, blue, and yellow. But this does not prevent them from living a pleasant life. You must know that most mammals only have two types of cone cells.

Cats sacrifice their sense of color in exchange for their super powerful night vision capabilities. Therefore, when it is dark, cats become more sensitive than humans, and their pupils can expand to 90% of the eyeball surface in the dark. The weak light is enough for them to find prey.

Cat eyes also have other weird features. There is a "reflector" in its eyeball, a thin film that reflects light behind the retina, which is why its eyes look so bright.

cat whiskers

Every cat has a pair of mighty whiskers. Don’t underestimate those slender whiskers! Cat's whiskers may be just an appearance decoration for humans, but for cats, they are a special sensory organ.

As long as you observe carefully, you can find that the total length of the cat's whiskers is proportional to the width of the body. There are extremely sensitive sensory nerves at the roots of cat whiskers. As long as the tail of the whiskers touches an object, you can feel it. In fact, it is a supplement to the cat's visual senses and is a very important sensory organ in the cat's body. When cats catch mice in the dark night, they rely on the touch of their whiskers to find their way and balance their bodies. If a cat loses its whiskers, it will become stumbling and unable to flexibly chase mice. Therefore, when raising cats at home, you should try to protect the cat's whiskers, especially if there are children at home, and educate them not to scratch or pull the cat's whiskers.

compound eye

The insect has a pair of compound eyes on its head. A compound eye is composed of many small eyes. For example, a compound eye of a worker bee is composed of about 4000-5000 small eyes; a compound eye of a drone is composed of about 8000 small eyes. The compound eyes of insects can distinguish the shape, size and color of objects.

fish nostrils

The fish's nostrils are located in front of the head and eyes and are used for smelling. The lateral line of fish There is a lateral line on both sides of the fish body, which is composed of small holes on the lateral line scales. The lateral line is connected with the nerves and has the function of sensing the direction and speed of the water flow.

insect tentacles

The insect has a pair of antennae on its head. Different types of insects have different shapes of their antennae. For example, the antennae of locusts are filamentous, the antennae of silkworm moths are feather-shaped, and the antennae of cabbage mealybugs are rod-shaped. Antennas have functions such as touch and smell, and insects rely on them to sense external conditions, identify odors, and find food.

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"Animals Around You" PPT courseware for making friends with animals:

"Animals Around You" PPT courseware for making friends with animals. Common animals: cats, dogs, sparrows, turtles, turtles, snakes, goldfish, ants, snails. Characteristics of cats. Walking: There are fat pads on the bottom of the toes, so they walk silently. Food: They like to prey on rodents, and sometimes frogs and snakes. Temperament: docile Behavior: Sensitive..

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Update Time: 2024-09-20

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