That was me. The Society's answer to your question on where the species came from is in the article "Ark" in the Insight volumes:
*** it-1 pp. 164-165 Ark ***
The “kinds” of animals selected had reference to the clear-cut and unalterable boundaries or limits set by the Creator, within which boundaries creatures are capable of breeding “according to their kinds.” It has been estimated by some that the hundreds of thousands of species of animals today could be reduced to a comparatively few family “kinds”—the horse kind and the cow kind, to mention but two. The breeding boundaries according to “kind” established by Jehovah were not and could not be crossed. With this in mind some investigators have said that, had there been as few as 43 “kinds” of mammals, 74 “kinds” of birds, and 10 “kinds” of reptiles in the ark, they could have produced the variety of species known today. Others have been more liberal in estimating that 72 “kinds” of quadrupeds and less than 200 bird “kinds” were all that were required. That the great variety of animal life known today could have come from inbreeding within so few “kinds” following the Flood is proved by the endless variety of humankind—short, tall, fat, thin, with countless variations in the color of hair, eyes, and skin—all of whom sprang from the one family of Noah.
So, in short, the species came from what creationists call "microevolution", the natural variation of life within certain prescribed boundaries. Like blondie, I am reporting, not supporting.