What's a kind?Yes, your favorite word....."evidence".
Farmers have known for years as well as others who breed animals to produce hybrids that may be better for a certain purpose, that you will come to a wall. Sooner or later, your interbreeding of animals that can produce offspring together, will come to a point where the offspring are infertile, a dead end.
All dogs can breed with each other, to my knowledge any way. I don't know the lineage of horses and donkey's but I do know that there is no further hybrid possible with the breeding of these two as you get a mule which is not capable of producing any more further hybrid.
Golden Retrievers can mate with husky's because they are the same "kind".... they are dogs......
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