"Apparently. Nobody knows how they predicted it, but they did. Spotted
it coming several years ago, so they've been romping through parallel
after parallel trying to find one they can migrate to. They found one,
sort of a desperation choice. It's cold and arid and full of impassable
mountain chains. With an uphill fight they can make it support a
fraction of their population."
Tommy shook his head helplessly. "They picked a very sensible system for
getting a good strong Grdznth population on the new parallel as fast as
possible. The males were picked for brains, education, ability and
adaptability; the females were chosen largely according to how pregnant
they were."