Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

How many eyes does an eyeless big-eyed spider have? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Comments on the article Comments on the article

Did you know?

How many eyes does an eyeless big-eyed spider have?

a) No eyes.
b) There are no eyes, but they are large.
c) One big eye that doesn't work.
d) 144 eye-like warts.

He has no eyes.

The blind arachnid was first discovered in 1973, and the entire population lives in three impenetrable caves on the volcanic island of Kauai, which is part of the Hawaiian archipelago.

As is often the case with cave dwellers, the spider evolved without the need for vision, however, being a representative of the big-eyed spider family, it simply must be called "big-eyed" (that is, if its eyes did cut through, they would certainly be large).

Adults are comparable in size to a fifty pence coin. A friend-neighbor and at the same time the main food source of the eyeless big-eyed spider is the Kauai cave amphipod: a small crustacean resembling a blind translucent shrimp.

Author: John Lloyd, John Mitchinson

 Random interesting fact from the Great Encyclopedia:

Can salamanders live in fire?

Have you ever seen a salamander? The appearance of these creatures is not the most attractive. Their lean body, long tail and spread legs resemble a lizard. And perhaps because they have smooth, shiny skin that always looks wet, there is a legend that they can walk through fire without taking any damage. But this is completely untrue.

The natural habitat of salamanders is water or a cool, damp place. If they are deprived of such an environment, they die. Salamanders are amphibians, which means they can live both in water and on land. Strictly speaking, the only true salamanders live in Europe. But in other parts of the world there are many animals that closely resemble salamanders. Salamanders usually lay their eggs in water.

Their cubs have gills, like real aquatic animals. But as an adult, a salamander usually develops lungs, loses its gills, and lives on land. There is a giant Japanese salamander, up to 1,5 m long, retaining both gills and lungs. The black newt greatly annoys the fishermen, because they greedily eat their bait.

Other salamander-like creatures do not develop lungs at all and spend their entire lives as aquatic animals. These include the Mexican axolotl. The newts of Europe and America differ from other salamanders in that they can return to life in the water and turn back into aquatic animals after living on land for about two and a half years. Of the European salamanders, the fire salamander is the most famous. Its length is approximately 23 centimeters, and if frightened, it releases a poisonous liquid.

 Test your knowledge! Did you know...

▪ Who can be called a genius?

▪ What unfortunate space explorer is the lunar crater named after?

▪ On which flag could you see a three-headed eagle?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Freescale expands range of automotive microcontrollers 11.05.2008

Freescale Semiconductor has expanded its popular 8-bit microcontroller (MCU) S08SG family.

The new models S08SG16 and S08SG32 are flexible general purpose MCUs primarily for the automotive industry: LIN nodes, mirror control modules, power windows, battery management systems, climate control, heated seats, etc.

Operating at frequencies up to 40 MHz and with 16 or 32 kB of flash memory, the S08SG16/32 MCUs "push the performance envelope of an XNUMX-bit device," the company says. The presence of integrated timers makes them well suited for motor control circuits. In addition, these microcontrollers make it possible to simplify the development of LIN systems due to the built-in serial communications interface (SCI).

The devices also include voltage regulator circuits, input-output multiplexers, analog-to-digital converters. The high degree of integration of the S08SG16/32 helps to reduce the complexity, size and cost of structures, and to abandon many external components.

Other interesting news:

▪ Intel sold 1.000.000.000 processors in 25 years

▪ Super sharp wooden knife

▪ Samsung steps up its work in the digital camera market

▪ Sleep saves you from infections

▪ Budget tracker with Bluetooth for monitoring children

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ site section Regulators of current, voltage, power. Article selection

▪ See Display offset in Adobe After Effects. video art

▪ article Who is Copernicus? Detailed answer

▪ article Adjuster of CNC machines. Job description

▪ article Triac dimmer. Encyclopedia of radio electronics and electrical engineering

▪ article Protection device for a three-phase electric motor from open-phase mode in case of an open circuit of the power fuse. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua

www.diagram.com.ua
2000-2024