Could egg freezing help save a rare British butterfly?

Humans have been freezing their eggs as a fertility treatment for decades, but what if we could do the same to insects' eggs?

Researchers from Anglia Ruskin University in Cambridge are investigating whether a vulnerable species of butterfly could be reared from eggs frozen in liquid nitrogen.

They hope it will safeguard the future of the black and yellow species and have a positive impact on conservation efforts across the world.