The second part of this book describes recent efforts to use stem cells for preserving endangered species, including the snow leopard and coral reefs. From this perspective, stem cells are an invaluable tool to preserve bio-diversities. Frozen cells and gametes can be obtained from animals at risk of extinction and even from microorganisms and corals suffering from heavy changes in the eco-system; this may allow the cultivation of a generation of stem cell lines and represents an exciting opportunity to support and ensure the conservation of precious varieties of living creatures. This discussion leads easily into the third section, which discusses stem cell banking as a way of safeguarding these endangered species.