Black and troubled run the waters of Alaska's Yukon River, as they always do at April's end. Cause of the Yukon's blackness: it is stuffed, crammed, jammed with malacopterygian teleosteans. By tens of thousands they are crowding upstream. Waterfalls as high as 15 ft. cannot stop them; a flirt of their powerful tails puts them over. They plunge under the face of higher falls, seeking a tail-hold for a second leap. As they hurl their sleek, silvery bodies over the falls, it is clear why they are called "salmon." (Latin salmo means "a...
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