A mammal that is the daughter of two female parents has been created for the first time.

Until now such a feat had been considered biologically impossible. But the mouse, called Kaguya, was born without the involvement of any sperm or male cell – only female eggs were needed.



In the same way that the birth of Dolly the sheep in 1997 shattered the dogma that an adult cell could never be reprogrammed to make a new individual, the fact that Kaguya lives challenges another one of long-held rule: that two mammals of the same sex cannot combine their genomes to give rise to viable offspring.



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