Helicopters are commonly used to herd wild horses into temporary corrals before they are loaded into trailers and hauled away.  | Rick Loomis/Los Angeles Times via Getty Images More than 90,000 wild horses and burros make their homes on public lands in the Western US, and each year, the federal government rounds up thousands of them. It typically holds them in large pens or pastures for months or years until they’re adopted or die — on the rationale that their wild population levels are just too high for the land to sustain.  But not all captured horses share these fates: Some are so...