"The article discusses the ethical aspects of reviving extinct animal species by manufacturing DNA (deoxyribonucleic acid) to order, a type of cloning developed in 2013. It discusses the ecological impact of adding a species back into the natural environment, the work of traditional conservationists, and how cloning is accomplished. It also discusses several species which scientists are in the process of trying to recover as of 2013, including the Pyrenean ibex, the gastric brooding frog, and the Tasmanian tiger."