I think it is clear from the Bible that "kind" there means species. And I understand that is what it was taken as all through history up until around the mid 20th century.
I don't think so, I think that 'kind' means exactly when we say kind, so each kind of animal was a division by whatever arbitary basis they considered, probably below the species level. After all, Genesis 7:14 says "They, and every beast after his kind, and
all the cattle after their kind, and every creeping thing that creepeth upon the earth after his kind, and every fowl after his kind, every bird of every sort", which implies a division of cattle by breed.
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