Questions for ‘America’s duck lands: These potholes are under threat’

White pelicans and other waterbirds lift off from a pond at Chase Lake National Wildlife Refuge.
Ryan Moehring/USFWS Mountain-Prairie/Flickr (CC-BY 2.0)
White pelicans and other waterbirds lift off from a pond at Chase Lake National Wildlife Refuge.
Ryan Moehring/USFWS Mountain-Prairie/Flickr (CC-BY 2.0)
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