For the first time, scientists have created a clone of an endangered U.S. species—a black-footed ferret named Elizabeth Ann. The researchers used cells from a donor that had been dead for more than 30 ...

Cloning promises genetic copies, but a growing body of research across dogs, mice, cattle, and primates shows that clones begin diverging from their donors almost immediately. Thousands of unique ...

Extinction has always been final — until now. Advances in genome sequencing, cloning, and genetic engineering have given scientists a real pathway to bring extinct animals back to life. This process, ...

During the last ice age, the Earth was home to significantly more megafauna -- animals with adult body weights over 100 pounds -- than it is today. The Woolly Mammoth is one of the best-known examples ...