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If Salmonidae (steelhead, salmon, etc) all return to the same tributary/stream that they were born in, why aren't there thousands of species?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If Salmonidae (steelhead, salmon, etc) all return to the same tributary/stream that they were born in, why aren't there thousands of species?	15
How did old and new world flamingos evolve the same morphology?	1