The reason why you shouldn't kill daddy long-legs, other than it being inhumane, is because they play an important role in our ecosystem. "Daddy long-legs feed on spiders, earthworms, and other insects," Jordan explains. "In addition to live prey, they will also eat dead insects, decaying plant material, and insect eggs. Their ability to eat pests in the garden like aphids makes them beneficial. Taking away any species from the ecosystem will disrupt the balance."
They may be annoying and sometimes a little scary to some, because they are essentially flying spiders, but they are harmless and therefore pose no threat. "Daddy long-legs are not poisonous, and they do not harm humans," says Jordan. "As they cannot bite or sting, they pose no direct threat to people and pets."
"The only issue they cause really is when they feed on plants and their roots they cause patches on the lawn, they lay their larvae which live underground," Sarah adds. "This then I suppose makes them an agricultural issue."