Macaw hybrids are also known. However, that doesn't mean they have to be part of the same interbreeding group in real life. This is a common barrier between animals. Actually no such breeding is possible between 2 different species. Why can some interbreeding species produce fertile offspring, while others—like horses and donkeys—cannot? Production of offspring depends on the pairing of homologous during the meiotic division for the production of gametes. This is an example of _____. This is so common, that biologists actually use a different formulation of Mayr's definition: they say, "If two populations can NOT interbreed, they are NOT the same species." 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. Two organisms of different species mate and produce offspring. In this definition, members of the same species must have the potential to interbreed. The scientist decide that some subspecies should actually be different species, species are moved to another genus, etc. Domestic fowl and game birds can also breed to give hybrid offsprings. In fact, all species of the genus Canis can mate and produce fertile offspring (Wayne et al., 1997, re: A. P. Gray, Mammalian Hybrids). In some case, organisms of different species can mate and produce healthy offspring, but the offspring are infertile, can't reproduce. This phenomenon is called ‘virgin births’ or ‘parthenogenesis’. This offspring cannot mate with its siblings or with members of either parental species. Some species can. For example, certain species of crickets will only mate with males that produce a particular mating song. The nomenclature changes over time. 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. For example, cage bird breeders cross breed finch species to produce hybrids. Behavioral isolation refers to the fact that many species perform different mating rituals. Scientists very often purposely mate different species to produce a desired offspring. 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. 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. You take a job as a research assistant at one of the richest fossil fields ever to be discovered. Taxonomy isn't carved in stone. Homologous chromosomes are essential for sexual reproduction and offspring. Other species rituals may include a mating dance or emitting a scent. 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