Clearing up the daddy long legs myth

A popular claim says daddy long legs have the deadliest venom of any creature, but fangs too short to break human skin. It is false on both counts. Much of the confusion comes from the fact that two very different animals share the same nickname.

  • Harvestmen (order Opiliones) are the classic daddy long legs with one rounded, pea-shaped body and extremely long, thin legs. They are arachnids but not spiders. They have no venom glands and produce no venom whatsoever. They also have no silk glands and do not build webs.
  • Cellar spiders (family Pholcidae) are true spiders with long, delicate legs. You often see them in loose, messy webs in basements, garages, and ceiling corners. They do have venom, which they use to subdue small prey. You can compare them in the cellar spider profile.
The claim has never held up when examined. It mixes up these two animals, then invents a danger that neither actually poses.

Do harvestmen bite or sting?

No. Harvestmen have no fangs designed to inject anything, and no venom to deliver even if they could. When threatened, their defenses do not include biting. Instead, they might play dead, detach a leg to escape a grip, or release a mild odor. You can handle one, and it simply cannot hurt you. That is why they are a favorite for teaching children that not every long-legged creature is a threat.

Are cellar spider bites dangerous?

Cellar spiders can technically bite, but reports of them biting people are extraordinarily rare. Their venom has not been shown to be medically dangerous to humans. Their fangs are small. They are far more likely to retreat, bounce their web when disturbed, or drop and hide than to approach you. In practice, they are one of the most harmless spiders you can share a home with.

Why are they actually helpful?

Both animals earn their keep:

  • Cellar spiders eat insects and will even prey on other spiders, including species people worry about more. A cellar spider in the corner is quietly doing pest control for free.
  • Harvestmen are scavengers and predators of tiny insects, mites, and decaying material. That makes them useful in gardens and damp outdoor spaces.
Killing them offers little benefit and removes a natural check on other pests.

How do I keep them out without chemicals?

Maybe you simply prefer not to share space with daddy long legs. If so, focus on making the area less inviting rather than reaching for pesticides:

  • Reduce indoor humidity with ventilation or a dehumidifier, since both types favor damp spots.
  • Clear away existing webs with a vacuum or broom; cellar spiders often abandon a disturbed corner.
  • Seal gaps around windows, vents, and foundation cracks to limit entry.
  • Reduce clutter in basements and garages where they like to hide.
There is no need for insecticides for these gentle animals. When pesticide use is warranted for something else, always follow the EPA-registered label.

What if I am worried about a genuinely dangerous spider?

That is a different situation. A small number of U.S. spiders are considered medically significant, such as the black widow and brown recluse. They look nothing like a daddy long legs. If you find a spider you cannot identify, or suspect one of these, our pest library can help you compare features. A licensed professional can confirm and handle a real concern. For any bite followed by worrying symptoms, contact a doctor. Call Poison Control at 1-800-222-1222 for exposure questions.