Subspecies
There are many subspecies of cutthroat, each native to a separate geographic area. The cutthroat trout is thought by scientists to have evolved over the past two million years from other Oncorhynchus species which migrated up the Columbia and Snake river basins. There are at least 10, and perhaps more than 14 subspecies, including:
Read more about this topic: Cutthroat Trout
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