Rhino resurrection is tempting, but if humans cannot save a species in nature, what future for animals that we manufacture?
We can't save all endangered species, but we could save some. Zoo populations will be the last hope for many threatened species.
The death of the last male northern white rhino in the world raises an interesting question: when does a species pass the point of no return?
Their flimsy chances rely on the eggs and sperm from the remaining three elderly animals, combined with frozen DNA from dead rhino.