Make sense. Thanks for clarify.
Please correct me if I am wrong.
Same species can have different breeds. Obviously these different breeds of the same species can "cross-breed" together, and their offspring can still reproduce without a problem.
It is not the same case when the "cross" is between different species. Think about liger (cross between tiger and lion), or mule (cross between donkey and horse). These cross-species breeding usually result in offsprings without the ability to reproduce again.
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