Here's one for you...if you're still out there.
It depends on the timeframe you are considering. Ultimately, all large mammals came from Asia! The other night on Discovery (I think), a program traced the evolution of mammals based on the fossils that have been discovered.
When the dinosaurs were wiped out 65 million years ago, giant flightless birds (i.e., over 6 feet tall) with huge beaks became the dominant predator everywhere but in Asia (which was then cut off from the rest of the continents by ice). Mammals remained small except in Asia, probably because the birds ate the big ones. It took about 20 million years for the mammals in Asia to diversify and get large, and for mammal carnavores to arise.
Then the earth got warm, and land bridges to the other continents opened up. Within a short period of time, the giant birds became extinct, probably because the mammal carnavores ate them. Mammals then became the dominant life form everywhere for the next 45 million years.
Unless G-d created these fossils just to mess with our minds.