"Insight: The Great Northern Migration -- Of U.S. Cattle"
"For more than a century, through a dozen dry spells when lakes disappeared and the land died, thousands of cows from the Swenson Land & Cattle Co have roamed the fields of Texas. Yet the drought currently ravaging the southern Plains has done what the Dust Bowl could not: chased them off this land and driven them more than 600 miles north to Nebraska."