Humans have made many animals extinct, but the question is: should we bring them back. Geneticists, biologists, environmentalists and ethicists have gathered to discuss the controversies. Some people say that by doing this we are playing God, while others say that we did it by killing them. Other scientists say it could be useful because it will add biodiversity and medicinal properties to the ecosystem. It is only possible to bring back species dating back about 10 thousand years. Recently scientists have significantly improved the cloning process. We can now transform adult animal cells into any cell type, including eggs and sperm, and then manipulate them into full-fledged embryos, which has led to the idea and development of reviving many other species including mammoths, frogs and