>>when did species stop producing its own species?<<
Many times — if a species creates a being that can’t reproduce with its own species, you have a new one.
So donkeys and zebras are the same species? (google zedonk) A donkey and a zebra can mate and have fertile offspring. Theis is because they are the same “kind”.
So, “kind” isn’t a scientific term. It doesn’t mean that it isn’t a valuable term. Perhaps it SHOULD be a scientific term, but isn’t. Perhaps it would be relatively close to the scientific term “genus”. The Bible says that animals produce after their own “kind”.
And kinds have not stopped producing after their own kind. The dog kind will always produce more dogs, even if they become classified as a different species.
never seen a can produce anything other than a cat. never seen a human produce anything buy a human. so when did that stop?