Spider Spider Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with fangs able to inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms. 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. , at least 45,700 spider species, and 113 families have been recorded by taxonomists. However, there has been dissension within the scientific community as to how all these families should be classified, as evidenced by
Ticks of domestic animals or more, respectively, whilst questing on the vegetation. Thus it is usually not practical to control them by pasture management. In addition, farmers find the priority to provide their stock with good feed often conflicts with the regimes for pasture rotation for tick control. Ticks affecting dogs and other companion animals around private houses are reduced by clearing of vegetation and leaf litter, mowing grass short, and fencing out deer and other wild animals that bring in ticks. Compared to other arthropods of veterinary and medical importance most species of ticks are long-lived over their whole life-cycle. "Ixodes" species in