i'm reasonably certain that "kind" is a generic word meaning "division" or "type" just like it is in, you know, ENGLISH.
i looked up the hebrew word, miyn, in a concordance, and it gave me this really incoherent bit about the difference between "kinds" and "species" like so:
1) kind, sometimes a species (usually of animals)
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Groups of living organisms belong in the same created "kind" if they have descended from the same ancestral gene pool. This does not preclude new species because this represents a partitioning of the original gene pool. Information is lost or conserved not gained. A new species could arise when a population is isolated and inbreeding occurs. By this definition a new species is not a new "kind" but a further partitioning of an existing "kind".
Bible Search and Study Tools - Blue Letter Bible
blb is great sometimes. lets you know what the word means, quite literally. however, sometimes, on important words, they write a huge paragraph with absolutely no justification whatsoever for anything it says.
if they had said "we think this is refering to genus, or family, but not species" it might have sounded a little more educated. but that shows clear and completely unreasonable bias towards creationism, and says NOTHING about what the bible actually says.
ironically, the list of uses of the word miyn below it are better. most of them appear to be refering to specific animals.