Recent events and advances address the possibility of cloning endangered and extinct species. The ethics of these types of cloning have special considerations, uniquely different from the types of cloning commonly practiced. Cloning of cheetahs may be ethically appropriate, given certain constraints. However, the ethics of cloning extinct species varies; for example, cloning mammoths and Neanderthals is more ethically problematic than conservation cloning, and requires more attention. Cloning Neanderthals in particular is likely unethical and such a project should not be (...) undertaken. It is important to discuss and plan for the constraints necessary to mitigate the harms of conservation and extinct cloning, and it is imperative that scientific and public discourse enlighten and guide actions in the sphere of cloning. (shrink)