The term 'eight-legged creature' is often used to refer to spiders, which are arachnids with eight legs. Spiders are found all over the world and have been around for millions of years. They are known for their ability to spin webs, which they use to capture prey. Spiders are also important predators in many ecosystems, helping to keep insect populations in check. The six-letter solution to this crossword is 'SPIDER'.