Behavioral isolation refers to the fact that many species perform different mating rituals. Why can some interbreeding species produce fertile offspring, while others—like horses and donkeys—cannot? Technically, wolves and domesticated dogs are different species, and they can mate and reproduce. In some case, organisms of different species can mate and produce healthy offspring, but the offspring are infertile, can't reproduce. Taxonomy isn't carved in stone. However, that doesn't mean they have to be part of the same interbreeding group in real life. Two organisms of different species mate and produce offspring. This is an example of _____. Production of offspring depends on the pairing of homologous during the meiotic division for the production of gametes. This is a common barrier between animals. Most wild animals need to mate to produce offspring, but there are a handful of species that do not mate and yet still produce new generations. The scientist decide that some subspecies should actually be different species, species are moved to another genus, etc. For example a bull dog is was originally a much uglier dog, though scientists have genetically modified the bull dog to have a much flatter face and smaller tail, making it much more attractive and more likely to be purchased in the market. Domestic fowl and game birds can also breed to give hybrid offsprings. This offspring cannot mate with its siblings or with members of either parental species. For example, cage bird breeders cross breed finch species to produce hybrids. The nomenclature changes over time. Similarly, lions and tigers, again two separate species, can mate and produce offspring. Scientists very often purposely mate different species to produce a desired offspring. In fact, all species of the genus Canis can mate and produce fertile offspring (Wayne et al., 1997, re: A. P. Gray, Mammalian Hybrids). $\endgroup$ – cezar Aug 21 '17 at 19:52 For example, certain species of crickets will only mate with males that produce a particular mating song. Macaw hybrids are also known. Generally, however, different species cannot mate and reproduce because of genetic differences. While human reproduction is straightforward, animal births are a lot more complex (and intriguing!). This phenomenon is called ‘virgin births’ or ‘parthenogenesis’. The same goes for horses and donkeys. You take a job as a research assistant at one of the richest fossil fields ever to be discovered. Birds are also known to mate with other birds belonging to a different species or subspecies. But in the case of mating of un-related species, the homolodous are absent.So, in case mating of un-related species never produce offsprings. Despite the absence of any scientific proof, great numbers of people still cling to the deep-rooted belief that humans can breed with animals and produce offspring. 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