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<blockquote data-quote="Frozen_Heart" data-source="post: 9361777" data-attributes="member: 7029687">It varies massively depending on individual species genetics, which gender each parent is, which gender the offspring is, individual variations and mutations, and how closely related the two species are.The most famous ones are mules and hinnys, which are near universally sterile. There have been odd cases where they have reproduced, but as a rule it doesn't happen. This is due to equine chromosomes being a bit of a disaster, and they love to split and form new chromosomes. The result is that even different subspecies of zebra struggle to interbreed.The other famous one is ligers and tigons. Unlike mules/hinnys, the females of these hybrids are fertile, though the males are sterile. There has been some suggestion that sapiens and neanderthals fell into this category.Then there are species like wolves and coyotes, or various species of wildcat, which have no barriers beyond behavior which prevents freely crossing. The two species produce viable and fertile offspring easily, and as a result there is still gene flow between the two populations. Clymene dolphins are a hybrid between striped and spinner dolphins, but eventually speciated into their own unique population. Grolars and Pizzlys seem to follow this trend, though it's not confirmed. There are growing numbers of them currently where the rangers of grizzlys and polar bears overlap due to climate change.And that's just mammals. If you go beyond that it gets really weird really fast. There are even cases which are a pain for conservation, such as hybrid japanese/chinese giant salamanders outcompeting pure japanese giant salamanders, or domestic/european wildcats swamping the gene pool and resulting in a population unable to survive the cold.</blockquote>

[QUOTE="Frozen_Heart, post: 9361777, member: 7029687"] It varies massively depending on individual species genetics, which gender each parent is, which gender the offspring is, individual variations and mutations, and how closely related the two species are. The most famous ones are mules and hinnys, which are near universally sterile. There have been odd cases where they have reproduced, but as a rule it doesn't happen. This is due to equine chromosomes being a bit of a disaster, and they love to split and form new chromosomes. The result is that even different subspecies of zebra struggle to interbreed. The other famous one is ligers and tigons. Unlike mules/hinnys, the females of these hybrids are fertile, though the males are sterile. There has been some suggestion that sapiens and neanderthals fell into this category. Then there are species like wolves and coyotes, or various species of wildcat, which have no barriers beyond behavior which prevents freely crossing. The two species produce viable and fertile offspring easily, and as a result there is still gene flow between the two populations. Clymene dolphins are a hybrid between striped and spinner dolphins, but eventually speciated into their own unique population. Grolars and Pizzlys seem to follow this trend, though it's not confirmed. There are growing numbers of them currently where the rangers of grizzlys and polar bears overlap due to climate change. And that's just mammals. If you go beyond that it gets really weird really fast. There are even cases which are a pain for conservation, such as hybrid japanese/chinese giant salamanders outcompeting pure japanese giant salamanders, or domestic/european wildcats swamping the gene pool and resulting in a population unable to survive the cold. [/QUOTE]

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