Scientists have used in-vitro fertilization techniques to develop hybrid rhino embryos -- "test-tube rhinos" -- which could help save the endangered northern white rhinoceros species, according to a new study.
Earth Day turns 48 this year and millions of people in roughly 200 countries will unite Sunday to find ways to protect and celebrate the planet.
Sudan, the world's last male northern white rhino, has died. But the effort to save the subspecies from extinction lives on.
The world's last male northern white rhino has died leaving only two females left to save the subspecies from extinction.
With three northern white rhinos left in the world, the only male is gravely ill, raising fears the subspecies is getting closer to extinction.