무료 동영상 감상 Yellowstone National Park: Wolf Cascade

(7.38 MB) 13 May 2016에 추가됨 196번 플레이됨 동물 야생동물 Nature
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Yellowstone National Park: Wolf Cascade

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Wolves are are inextricably linked to many other animal and plant species. The trophic cascade of effects caused by their reintroduction is being studied.