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Spiders are widespread on the face of the earth. There are about 45 thousand types of spiders that we can find in the world, except in the Antarctic Continent. The common feature of spiders is to have four pairs of eyes, eight feet, no wings and no mouth chewers, and carnivores. The distinctive character of the spider's physical is to have two body segments. The front part of the body is called a cephalothorax or prosoma that is a combination of head and chest. While the back of the abdomen (stomach) or opisthosoma. The link between the cephalothorax and the abdomen is a thin membrane called a pedicellus.
Generally, the spider does not have good eyesight, alias can not distinguish colors. It is only sensitive to darkness and light. To mark the presence of its prey, the spider relies on the vibrations that exist in its sail net. Or also on the land, water, and the place where he lived.
One of them is the type of profit profit that is below :
Diving bell spiders can take advantage of air bubbles for breathing underwater, which is basically as mini scuba-diving tank technique. The spider's body length is only 0.4-0.6 inches (10-15 mm), so a bubble can provide the air for him throughout the day.
