These bugs may secrete a strong smelling fluid that can stain the skin the purpose to repel birds and other predators from eating them. Somtimes called Stink Bugs for this reason
Are Hawthorn Shield Bugs a threat or nuisance to humans?
I would not want to find one in a mouthful of lettuce as they taste foul. This is a survival technique, once a bird eats one it will not eat another. Otherwise they don't bite or harm you in any way.
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