MEDINA, N.D. -- Nobody saw it happen. So far, nobody can explain it.
But in late May and early June, as many as 27,000 white pelicans -- the largest nesting colony of the great, gawky birds on the continent -- abandoned nests, eggs and hatchlings and flew away from Chase Lake National Wildlife Refuge in central North Dakota.
A smaller flock of 2,000 birds remained in a separate nesting area a few days longer, but they also abandoned Chase Lake, leaving a vast, heartbreaking litter of unhatched eggs and dead, featherless young.
Biologists and others have advanced many theories -- involving disease, predators, weather, food sources and other factors -- but so far none has been proven.
Nor is it clear where all those pelicans went before heading to the Gulf Coast for winter. But larger than usual numbers of pelicans have been spotted recently on waters near the Canadian border, on the Yellowstone River in eastern Montana and in wildlife refuges in South Dakota and Minnesota.
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