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. Toxic spider bites can cause redness in the bite, swelling, itching and pain. In severe conditions, dangerous insect bites can cause fatal allergic symptoms such as swelling in the throat and face, difficulty breathing and even loss of consciousness.
