No, they do not.
Its is a large likely hood that they would. Mice can turn cannibalistic in a minute, because of anything from hunger to stress.
Normally, a shrimp would not turn cannibalistic. However, there are shrimp that eat other shrimp if they are infected such as those that contract the black rot disease.
There would soon be no more grasshoppers.
That would be Hannibal Lecter, M.D.
Grasshoppers would lose their habitat and source of food. In cases of drought, greenery is destroyed. This would furthur expose the green grasshoppers on the brown land, and making it easier to prey on.
You might say, "Hannibal Lecter exhibited cannibalistic behavior." Or perhaps, "Few cannibalistic peoples remain today."
Grasshoppers don't become locusts, they are close relatives though.
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predators
Spiders are territorial and cannibalistic. Basically, spiders in a farm would either be unhappy or eaten.
Grasshoppers lay eggs, so technically their Labia/Labium would be the orifice on their underside that the eggs come out of.