New race to save rhino subspecies

Scientists create embryos; calf may be born in three years

BERLIN - Scientists say they are several steps closer to perfecting a method that could prevent the extinction of northern white rhinos, with only two known still to be alive.

According to a paper published on Wednesday in the journal Nature Communications, researchers have succeeded in creating embryos using frozen northern white rhino sperm and eggs from a southern white rhino, a closely related subspecies.