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How Bison Are Helping Cliff Swallows Build Their Nests
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07/06/20
In
Discovery
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 http://bit.ly/2JIluS5
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