Why do some people say that jumping spiders are close to humans? ,,

Jumping spidersIt is one of the most eye-catching spiders and can see prey up to 10 to 20 centimeters away. They often look with their eyes wide open and vigilant, and when you are at a certain distance from it, it will observe you and test if there is a threat to it, which is also an animal instinct.

Because jumping spiders rely on their eyesight to catch their prey, the feeling of raising a jumping spider is interactive to a certain extent, but it is not a mammal after all.

Spiders only have a nervous system.

But there is no brain system formed, so spiders have no intelligence and no consciousness, just a neurological instinct.

Jumping spiders are the only spiders with eyesight that rivals that of humans. If you look at a jumping spider face to face, it will also stare at you with a pair of large eyes, commonly known as the main eye, located in the front and middle of the head, which are used to perceive size, color, and shape. The other six secondary eyes are located on the side and are mainly used to monitor the movement of objects.

Jumping spiders are naturally observant, and they are not only capable of "jumping" onto their prey, as the name suggests. First, they will see and recognize their prey from a distance of 30 times their body length, and then quietly track them, crawling, waiting, and jumping as they go.

The main eye of the jumping spider is as sophisticated as a cat's eye, but the structure is very different. What we see from the outside is stationary, with a telephoto.

distance of the corneal lens. Behind each convex lens is a long eye tube that leads to the complex retina.

Light is refracted as it passes through a cone-shaped depression on the surface of the retina, which is like the lens of a telescope, creating the effect of magnifying the image.

For the spectrum from ultraviolet light.

Photoreceptors, which are sensitive to green light, are distributed in four layers. It is thought that the reason why jumping spiders can distinguish colors is because of this layered arrangement and the different levels of focus of different wavelengths of light.

In addition, the hierarchical arrangement of the photoreceptors at the bottom allows the spider to aim at the object from far to near without adjusting the crystal. In the middle area of the lowest level there is a small pit in which the receptors are very closely arranged. The pit is small, with only about 100 receptors, forming a viewing angle of about 2 degrees.

However, to compensate for this narrow-angle vision, jumping spiders have six muscles attached to the eye tube, so that they can rotate and move back and forth freely. As soon as it fixes its target prey, the eye lens casts a huge image in the pit, and the jumping spider monitors it by moving the hole.

Jumping spiders do not trap their prey by webs, and their highly evolved eyesight does not live in the dark of burrows like other spiders, and they will actively hunt insects during the day.

Most spiders can jump.

Spiders are the most abundant predatory natural enemies in terrestrial ecosystems, and their role in maintaining the stability of agricultural and forestry ecosystems cannot be ignored. The body is 1 90 mm long, and the body is divided into two parts: cephalothorax (anterior) and abdominal (posterior), and the cephalothorax is covered with dorsal armor and chest plate. There are two pairs of appendages in the cephalothorax, the first pair is chelicera, with chelicera, and the tip of the chelicera has a toxic gland opening; The chelicerae of the order straight palatine move anteriorly and backward, and the clamp of the order palatine moves laterally and in opposite directions.

This is a matter of species.,Generally spiders that don't connect to the web much will jump.。。。 There are also many types of jumping spiders, and the spiders that catch the big web can't jump.

It seems that the black spider that pulls the net to catch insects can't jump, but the spiders in the forest can.

The jumping spider stares at a person to observe, to judge whether the person is dangerous to it or not, which is an instinct of animals. Jumping spiders have very keen eyesight, can see prey up to 10-20 cm away, in addition to living in groups, they are interested in people or anything that comes close.

Introduction to Jumping Spiders

Jumping spider, a kind of spider subject, its body is short and thick and slightly flattened, the steps are short and strong, and it is good at jumping, so it is named "jumping spider".

Most jumping spiders are no more than 15mm in length, and their body color is brilliant and colorful, often showing a metallic luster in the sun.

Jumping spiders have 8 eyes, and their strength is very sharp, they can see prey 10-20 cm away, and mainly rely on their eyesight to catch prey.