Your answer for the above question may be the 'police' because police use tear gas against the crowd but the real one of the bird. Its a special type of bird. This birds are capable of producing a liquid in their body . When the predators or enemy come to attack them they spread this liquid to the the eyes of them. If it enter to the eyes of the enemy they get pain in their eye and also it make them blink for few time. At this time this bird can escape with its life.
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