Researchers found the mammoth walked a distance equal to nearly twice the circumference of Earth using isotopes of strontium and oxygen.
DNA recovered from two mammoths that lived more than a million years ago reveal new insights about the evolution of these extinct animals.
Bringing extinct animals back from the dead could hurt existing species, says a new report.
The great auk could live once more, but is that such a good idea?
They died of thirst on a remote Alaskan island.