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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. Helena Burke has the details. (Picture credit: Swallowtail & Birdwing Butterfly Trust / PA).