GERING, Neb. -- The ibex head was jammed next to the moose, whose velvety antlers brushed against a rare red lechwe and an African bongo. Below them were several preserved bobcats, and at the far end of the storage container stood endangered leopards, frozen in lifelike mid-prowl. In all, there were more than 800 big-game and exotic animals piled into an old railroad car behind the Wyobraska Wildlife Museum, a modest and lightly visited facility here, far from any population center. It was just one of four large containers packed with animal mounts and skins -- trophies shot on expedition...