Wasps and Bee's are insects that sting.
having a sting or the capacity to sting; "stinging insects"; "stinging nettles"
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Male bees, or drones, do not have a sting. In bees, wasps and similar insects the sting is a modified ovipositor (egg laying tube) -- an organ that males do not have.
It could be a grasshopper or a lacewing or many other insects.
Wasps have one sting, as do all other similar insects.
The two main reasons are self-defence and in defence of the colony.
Formic acid is the chemical in the sting or bite of most stinging insects.
Bees will sting birds when their beehive is under attack. However, birds tend to be quicker at consuming the insects before the bee can attack.
The only insects that can truly sting are bees, wasps and ants, and then just the social species (living together in colonies).
The queens and workers can but their sting does not have barbs like a the honeybee, so they can sting more than once. Male's cant sting because they don't have a stinger. Males have a genital capsule for mating.
A stinger is a modified ovipositor (egg laying tube) so only female insects can sting.