A new mixture of cryoprotectives allows for an unprecedented high motility of frozen rhinoceros sperm after thawing, report scientists from the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) in Berlin, Germany. These new cryoprotectives can increase the prospects of utilising assisted reproduction techniques for many endangered wildlife species. The study, based on three rhinoceros species, has now been published in the journal PLOS ONE.