As an entomologist with a focus on insect behavior and ecology, I can tell you that ladybugs, also known as ladybird beetles, are generally harmless to humans. They are beneficial insects that feed on pests like aphids, making them a welcome sight in gardens. While it is theoretically possible for a ladybug to bite a human, it is extremely rare. Ladybugs do not have strong mouthparts designed for biting; instead, they have mouthparts adapted for sucking the fluids of the insects they prey upon. If a ladybug were to bite, it would not be harmful or painful to a person. However, they can release a fluid from their legs that has a slightly unpleasant odor, which is a defense mechanism to deter predators. This is not a bite, but rather a chemical reaction to being handled roughly.

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Lady bugs have biting mouthparts, but will not attack you. You really have to be torturing a ladybug for it to bite. Its first line of defense will actually be to bleed on you (their hemolymph is yellow, so if it looks like the ladybug urinated in your hand, that's its "blood").read more >>