World's Last Male Northern White Rhino Dies

Nairobi, Kenya (AP) -- The death of the world's last male northern white rhino, Sudan, doesn't end efforts to save a subspecies of one of the world's most recognizable animals. The focus now turns to his stored semen and that of four other dead rhinos, as well as the perfection of in vitro fertilization techniques and the critical need to keep the remaining two females alive.

Whatever happens, conservationists hope the lessons learned in the endeavor can be applied to other critically endangered species.