The aquatic Marisa youngs live in there, feasting on the young plants. So the farmer paid to have them removed. The child who take the offer just pick them up and throw them to the street.
Adapted to water, they are weak to the heat and their legs are too weak to take them more than a very short distance before being tired out.
Try calling them cute when they wreck your crops and cause the price of agricultural products to skyrocket. Whether you're the farmer or the consumer, you'd immediately pay for their absolute extermination and destruction.
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