Is just a little homework too much to ask? Some of this stuff would be so easy to get right and still be very cool. I don't get it.

If you want those animals - base the story in an area of the world where they existed (even if you are going to play around with the timelines a bit. If you want northern Africa - do a quick search for the megafauna that lived in that area.

Seems simple enough.

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Spock Jenkins of the Vulcan Jenkins'.