Where do spiders live that can move like acrobats performing somersaults? Detailed answer

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Where do spiders live that can move like acrobats performing somersaults? Detailed answer

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Where do spiders live that can move like acrobats performing somersaults?

Living in the Moroccan sand massifs, spiders of the species Cebrennus rechenbergi are known for their unique way of moving. In addition to the usual step, they can reach speeds of up to 2 m / s, pushing off with their limbs and turning over their heads like acrobats performing somersaults.

Spiders can do such somersaults even up sandy slopes with an inclination angle of up to 40 °.

Authors: Jimmy Wales, Larry Sanger

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How are fossils formed?

Fossils are the remains of animals and plants preserved in stone. Sometimes they look like shells, bones, scales or other hard parts of the animal body. Sometimes the animals are preserved whole. In the case of plants, these may be charred pieces of wood or a thin carbon film left after decomposition. Often come across and paw prints of animals on soft clay, subsequently hardened and turned into stone. When a living organism dies, its body does not completely disappear. The soft parts rot, while the hard parts are ravaged by wind and precipitation.

However, if the body is covered with sand or silt after death, parts of it may be preserved for a long time and after a long period of time turn into fossils. Most of the fossils belong to animals and plants that lived in the water. This is because, after death, their body sinks to the bottom, where it is quickly covered with a layer of sand applied by water. Gradually, the remains of the organism are buried deeper and deeper under sand and silt, the lower layers of which harden under increasing pressure, turning into so-called sedimentary rocks.

Sedimentary rocks accumulate very slowly, and the bodies of plants and animals buried in them undergo constant changes. The mineral salts in the water fill the tiny pores in the bones and around the shells.

After the shells themselves are destroyed, their prints remain on the stone. This process has been going on for thousands of years. On land, the dead bodies of living organisms can be under a layer of wind-blown sand or ash ejected from a volcano during an eruption. Insects and other small animals sometimes get stuck in the sticky resin. When solidified, the resin turns into amber and protects the corpse from destruction. Larger animals can be kept in swimming pools or in permafrost conditions.

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