What's notable about this story is that they were riding in a conservation reserve. So each rider was fined $2,750. One might assume they had valid offroad license plates / registrations and insurance - as it didn't mention any fines for those items.
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...each fined $2,500 under the Endangered Species Act for unlawfully damaging or destroying habitat and $250 for illegally operating a motor vehicle within a conservation reserve contrary to the Provincial Parks and Conservation Reserves Act
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