Ecosystems can collapse suddenly and totally. Frozen zoos are trying to create archives of genetic material to prevent total extinctions.
Scientists have created embryos from the eggs of southern white rhino and sperm from their northern counterparts.
It's time to admit the age of pristine nature is over. In its place is humanity and planet-shaping technologies, from gene editing to climate engineering. Earth Day in a Synthetic Age.
Rhino resurrection is tempting, but if humans cannot save a species in nature, what future for animals that we manufacture?
The last Carolina parakeet died in a zoo a century ago. A scientist tries to unravel some of this bird's lasting mysteries.
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?
The "decision science" approach helps avoid unanticipated consequences of programs to bring species such as New Zealand's little bush moa, Waitomo frog, or laughing owl back from extinction.
The Galapagos Islands' giant tortoises are one of the world's best examples of evolution. Scientists are pioneering new conservation strategies to save them from extinction and restore their habitat.
Is an extinct animal really gone forever?
When 100-year-old giant tortoise Lonesome George died in 2012, the world thought his species was lost forever. We went to the Galápagos Islands looking for 'extinct' tortoises – and we found them.
Their flimsy chances rely on the eggs and sperm from the remaining three elderly animals, combined with frozen DNA from dead rhino.