A spider’s muscles pull its legs inward, but cannot lengthen its legs out yet again. Alternatively, it have to pump a watery liquid into its legs to press them out. A useless spider’s legs are curled up simply because there isn't a fluid to extend the legs once more.[12] https://spencerpxdgj.humor-blog.com/18809627/5-simple-techniques-for-spiders-facts-and-information