or else the result of human-forced matings, as is the case with ligers (lion-tiger hybrids) and mules (horse-ass hybrids). It is not common knowledge that many bird and fish species successfully hybridize in the wild. The scientists found that birds were most likely to produce fertile hyb...
One thing included in the definition of a living thing is that it must be able to reproduce. However, mules can't reproduce. Why would we include reproduction in the definition of a living thing? Why have most living organisms adapted to brea...
equids). Even when two members of closely related species mate, there may not be conception or other problems arise. For example if horses mate with donkeys (two equids) the resulting "mules" are infertile. The term