You might want to take a look at some of the research done on how human beings categorize "things" (living or dead). There appears to be one or more structures in the brain already hardwired to assist in the categorization.Here's a quicky about how rhesus monkeys do it ~ http://web.mit.edu/~davidf/www/ABCNEWS_CatsandDogs.htm
There are a hundred thousand or more references to "how the brain categorizes" on the net, so read your heart out.
Oh, yeah, the brain "categorizes" different aspects of the same thing ~ e.g. animal shape in one place, animal color in another.
I suspect most of the intensity of emotion about "kind" arises out of the realization by many people that they do, in fact, think that way ~ even if the critters are unrelated.
As an example, remember when folks wanted to believe the black and white giant panda was closely related to the black and white raccoon?
They're not ~ they're just another kind of big ol'fluffy bear that can smash a steel beerkeg with simple, playful strokes.
So, knowing what I know now about how brain categorization works, I understand what the ancients were saying. BTW, I also have to note here that there are instructions in Genesis about how to set up a Memory Palace in your mind to help you remember vast quantities of information better, so that means the ancients, too, had an objective understanding of how we remember. They'd likely not stumble over an idea like evolution, but'd just pop it into the memory slot appropriate for such processes.
Which version of the Bible are you reading? It's pretty clear from Genesis 1 that within the general category of "animals" there are many different "kinds."
If you've got a few minutes, let me encourage you to take a look at this page -- http://www.answersingenesis.org/pbs_nova/0924ep1.asp#kinds -- for an exploration of how those who adhere to the "Biblical creationist model" interpret "kinds."