It may be possible to target specific pests by engineering genes for the production of spider toxins into viruses that infect species such as cotton bollworms.  Choice of prey may be able to alter the color of spiders. These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed. Chemical sensors provide equivalents of taste and smell, often by means of setae. See Spider taxonomy.  Even widow spiders (genus Latrodectus), which are notoriously cannibalistic, have formed small colonies in captivity, sharing webs and feeding together. Morphological changes require pigment synthesis and degradation. The spider (the Araneae order) is a breathing arthropod that has eight legs and chelicerae with fangs that inject toxins. All abovementioned things have originally been legs (in spider ancestor). This is true for all arachnids. It is initially a liquid, and hardens not by exposure to air but as a result of being drawn out, which changes the internal structure of the protein.  Spiders can generate pressures up to eight times their resting level to extend their legs, and jumping spiders can jump up to 50 times their own length by suddenly increasing the blood pressure in the third or fourth pair of legs. Because of […], Outer space has always excited the curiosity of mankind. As a result of their wide range of behaviors, spiders have become common symbols in art and mythology symbolizing various combinations of patience, cruelty and creative powers.  Earlier spider fossils come from a few lagerstätten, places where conditions were exceptionally suited to preserving fairly soft tissues.. Unlike many land-living arthropods, male spiders do not produce ready-made spermatophores (packages of sperm), but spin small sperm webs onto which they ejaculate and then transfer the sperm to special syringe-styled structures, palpal bulbs or palpal organs, borne on the tips of the pedipalps of mature males.  A few spiders use the surfaces of lakes and ponds as "webs", detecting trapped insects by the vibrations that these cause while struggling. These spiders also prefer sugar solutions to plain water, which indicates that they are seeking nutrients. This highlights the importance of these secondary eyes to the function and survival of the spiders. There probably isn't any particular reason why spiders evolved to have eight, insects six, horseshoe crabs ten, or … , Mature female bolas spiders of the genus Mastophora build "webs" that consist of only a single "trapeze line", which they patrol. About 99% of spiders have eight eyes.  Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exceptions of air and sea colonization.  However, a laboratory study showed that spiders reduce the building of these decorations if they sense the presence of predators.  Instead, they have mouths that point forwards and downwards, and all have some means of breathing air. Various researchers have suggested that horizontal webs offer compensating advantages, such as reduced vulnerability to wind damage; reduced visibility to prey flying upwards, because of the backlighting from the sky; enabling oscillations to catch insects in slow horizontal flight. However, there are no consistent differences between orb webs built for use during the day and those built for use at night. Highlights the importance of these decorations if they sense the presence of predators can lose this highlights the importance these. 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