In the 1960s a Montana landowner bought 2 mute swans for private pond. Decades later their flock reached 120; alarming Yellowstone officials

A pair of ornamental swans bought for a private pond in Montana in the 1960s eventually became the starting point for a very different kind of wildlife story. By the late 1970s, the flock in Paradise Valley had grown to 120, drawing the attention of Yellowstone National Park officials concerned about possible competition with native trumpeter swans.

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