Smithsonian Channel
チャンネル登録者数 429万人
50万回視聴 ・ 7332いいね ・ 2020/07/06
It's a partnership that's as unlikely as any: herds of bison on the move are kicking up chunks of earth. This, in turn, gives cliff swallows the valuable mud pellets they need to build their nests.
From the Series: Epic Yellowstone: Life on the Wing bit.ly/2JIluS5
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