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  • BBC Science Focus Magazine

    THE EYES HAVE IT

    Jul 06, 2022 4 minutes
    WORDS: DR HELEN PILCHER
    by
    DR HELEN PILCHER

    HAIRY HUNTER

    ORNATE WANDERING SPIDER, BRAZIL

    It seems that spiders don’t like odd numbers. Two body segments, eight legs, one to four pairs of spinnerets and always an even number of eyes. Most spiders, like this ornate wandering spider, have eight simple eyes, but some have six or two. The way a spider catches its food has a strong influence on the ways these eyes are arranged. Web-building spiders, for example, tend to have smaller eyes that are evenly spaced apart, but the more centrally placed eyes of visual predators, like our friend here, are often enlarged. All the better to glimpse a tasty morsel with! There are principal eyes (the bottom pair here) and secondary eyes (the rest),

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