Cicadas have a long proboscis, under their head, which they insert into plant stems in order to feed on sap. It can be painful if they attempt to pierce a person's skin with it, but it is unlikely to cause other harm. It is unlikely to be a defensive reaction and is a rare occurrence. It usually only happens when they are allowed to rest on a person's body for an extended amount of time.
Many people around the world regularly eat cicadas. They are known to have been eaten in Ancient Greece as well as China, Malaysia, Burma, Latin America, and the Congo. Female cicadas are prized for being meatier.
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