How American bison help cliff swallows


This 6 July 2020 video from Yellowstone National Park in the USA says about itself:

How Bison Are Helping Cliff Swallows Build Their Nests

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.

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