Cincinnati Zoo

The Cincinnati Zoo has produced what's believed to be the first non-human offspring using "glass" sperm. They are kittens named Elsa and Vito.

The Center for Conservation & Research of Endangered Wildlife (CREW) harvested domestic cat sperm and preserved it in ultra-rapid freezing liquid nitrogen to form "glass" rather than ice crystals. This process is called vitrification.

The Cincinnati Zoo

With no more than 100


The Cincinnati Zoo will begin a massive project later this year. It plans to assess the health of all of its rare plant species stored in liquid nitrogen.