What is special about the spider?

What is special about the spider?

The spiders have eight legs with hairs and spines serving as sensory and communication organs. They are devoid of antennae, wings and chewing parts. Insects have six legs and have wings and antennae.

How does a spider see?

Most of spiders would have a vision of recognition of large forms, not necessarily in color, we do not know, and they mainly perceive changes in luminosity. Some families like spiders sauté pans, or spiders wolves running on the ground, would have good vision.

Why shouldn’t spiders be killed?

But beyond attacking others spidersarachnids are especially effective in getting rid of “harmful organisms” that can carry diseases such as mosquitoes.

How strong is a spider?

The spiders they have a strength superhuman Thanks to their Velcro paws capacity explained above, the spiders are capable of supporting up to 170 TIMES their own weight without lifting off a wall!

What is the field of vision of a spider?

Vision of the most species ofeast spiders poor quality, but tarantulas have a pretty good one. The anterior median eyes have a field limited (less than 5°) but excellent resolution (about 10′).

Do spiders see colors?

Indeed, we have the ability to distinguish red, green and blue (trichromatic vision). The spiders they can only see green and red (dichromatic vision). Their four pairs of eyes give them greater sensitivity to movement and a greater viewing angle.

Where are the spiders eyes?

They are placed in front of the cephalothorax in two rows of four eyes or according to another disposition characteristic of a family or a genus. The vision of spiders is nevertheless very bad. Only the pair ofeyes located in the middle and at the front, allows direct vision.

What is the role of spiders in nature?

Often unloved, spiders nevertheless play an essential role in nature. In particular, they regulate insect populations with incredible efficiency. Explanations in pictures by arachnologist Christine Rollard.

Why do spiders have simple eyes?

Apparently the eyes of spiders are simple, it’s not like insects that have faceted eyes. Spiders just have a small retina, behind it there are a little bit of muscles to orient them, but as far as vision is concerned, from what we know, it’s rather poor.

How to hunt spiders?

When it’s time to hunt, spiders have more than one trick up their sleeve! Besides the technique of capturing in a large web, here are some other hunting techniques that they can implement: Thanks to the surface tension of the water and the micro-hairs on its legs, the dolomede can walk on water!

What are the different types of spiders?

The linyphiids, small, dark-colored spiders, hang under their webs in sheets, stretched out in the vegetation. Lycoses, wolf spiders, have no webs: they are either wandering on the ground or hidden in their burrows. Salticides, or jumping spiders, are the most numerous. They escape by jumping.