Nonetheless, in evolutionary terms, like humans the arthropods have been extremely successful, and form one of the earth's great families. There are a huge number of arthropod species distributed all over the world, and many can be found at close quarters with human beings. To date, over 30,000 species of spiders alone have been recorded.
然而，在演化上，節肢動物與人類一樣表現傑出，都是地球上的大家族，牠們種類繁多，全球廣佈，更緊隨人類腳步，進入都市生活，目前已紀錄的蜘蛛就有三萬多種。