Orange spiders are among the largest spiders in existence. They can be found to be one inch in length with long legs. They are not poisonous but their bite does hurt because of the size of the spider. They are known to weave rather large webs and stick to the outside of houses and trees. People have been known to have a skin reaction to the bite and if this happens you should go to the doctor. But generally, orange spiders are not poisonous.