Spiders' stomach contents can reveal which insects and animals are living around them

A study published in ‘Experimental and Applied Entomology’ has explored how spiders could tell what animals are living around them by examining traces of prey DNA left inside their bodies. The research tested how ‘reliable prey DNA’ could be found in wolf spiders after feeding and how long that genetic evidence remained detectable. The experiments showed that DNA from some prey could still be detected several days after a meal, although the chances fell as digestion progressed. The findings suggest that spiders could become useful biological samplers for studying food webs and the small creatures living in an area.