Contrary to urban legends and popular beliefs that daddy long legs deliver the most powerful venom in the world, no actual scientific evidence exists to support this claim. While a propensity to call several different spider species daddy longleg spiders, including cellar spiders, crane flies, who are insects and harvestmen, who belong to the arachnid family persists like their legendary venom, none of these insects and arachnids pose health threats to humans or pets.
Harvestmen, for example, do not possess venom glands and cellar spiders’ fangs are too short to deliver an effective bite to humans. Harvestmen can be guilty of assaulting your olfactory senses, in addition to scaring people and animals with their bizarre ability to cluster together to defend themselves against predators. True daddy long legs or harvestmen excrete chemicals that put off a distinctly, unpleasant odor from special glands in their bodies. In a large group, it creates a much more pronounced effect than individuals would, in a collaborative defense against larger predators.
The rhythmic, undulating movement harvestmen can manifest in their surreal clusters can send animals and humans running for their lives on witnessing a throbbing wobbling mass headed for them should the unsuspecting witnesses happen upon a clustered group of harvestmen by accident.